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Finding the Fourth Proportional to 645,902.71, 891,287.81 and 373,988.96

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Solution

The fourth proportional to 645,902.71, 891,287.81 and 373,988.96 is: 516,071.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,902.71 : 891,287.81 = 373,988.96 : x
  2. Step 2: Convert to fraction form
    645,902.71/891,287.81 = 373,988.96/x
  3. Step 3: Cross multiply
    645,902.71x = 891,287.81 × 373,988.96
  4. Step 4: Simplify right side
    645,902.71x = 333,331,796,346.12
  5. Step 5: Solve for x
    x = 333,331,796,346.12/645,902.71
  6. Step 6: Final answer
    x = 516,071.21

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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.