Home / 645,016.31-890,133.14-354,640.13

Finding the Fourth Proportional to 645,016.31, 890,133.14 and 354,640.13

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Solution

The fourth proportional to 645,016.31, 890,133.14 and 354,640.13 is: 489,409.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,016.31 : 890,133.14 = 354,640.13 : x
  2. Step 2: Convert to fraction form
    645,016.31/890,133.14 = 354,640.13/x
  3. Step 3: Cross multiply
    645,016.31x = 890,133.14 × 354,640.13
  4. Step 4: Simplify right side
    645,016.31x = 315,676,932,486.91
  5. Step 5: Solve for x
    x = 315,676,932,486.91/645,016.31
  6. Step 6: Final answer
    x = 489,409.23

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Double scale
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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.