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Finding the Fourth Proportional to 513,881.80, 770,822.70 and 139,904.20

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Solution

The fourth proportional to 513,881.80, 770,822.70 and 139,904.20 is: 209,856.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,881.80 : 770,822.70 = 139,904.20 : x
  2. Step 2: Convert to fraction form
    513,881.80/770,822.70 = 139,904.20/x
  3. Step 3: Cross multiply
    513,881.80x = 770,822.70 × 139,904.20
  4. Step 4: Simplify right side
    513,881.80x = 107,841,333,185.34
  5. Step 5: Solve for x
    x = 107,841,333,185.34/513,881.80
  6. Step 6: Final answer
    x = 209,856.30

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.