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Finding the Fourth Proportional to 489,971.32, 676,220.25 and 308,680.21

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Solution

The fourth proportional to 489,971.32, 676,220.25 and 308,680.21 is: 426,016.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,971.32 : 676,220.25 = 308,680.21 : x
  2. Step 2: Convert to fraction form
    489,971.32/676,220.25 = 308,680.21/x
  3. Step 3: Cross multiply
    489,971.32x = 676,220.25 × 308,680.21
  4. Step 4: Simplify right side
    489,971.32x = 208,735,808,776.25
  5. Step 5: Solve for x
    x = 208,735,808,776.25/489,971.32
  6. Step 6: Final answer
    x = 426,016.38

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Double scale
Find fourth proportional to 489,972.32, 676,221.63 and 308,681.21
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.