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Finding the Fourth Proportional to 717,208.43, 989,727.76 and 390,527.12

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Solution

The fourth proportional to 717,208.43, 989,727.76 and 390,527.12 is: 538,916.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,208.43 : 989,727.76 = 390,527.12 : x
  2. Step 2: Convert to fraction form
    717,208.43/989,727.76 = 390,527.12/x
  3. Step 3: Cross multiply
    717,208.43x = 989,727.76 × 390,527.12
  4. Step 4: Simplify right side
    717,208.43x = 386,515,534,659.33
  5. Step 5: Solve for x
    x = 386,515,534,659.33/717,208.43
  6. Step 6: Final answer
    x = 538,916.61

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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.