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Finding the Fourth Proportional to 718,915.61, 992,096.70 and 396,628.31

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Solution

The fourth proportional to 718,915.61, 992,096.70 and 396,628.31 is: 547,343.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,915.61 : 992,096.70 = 396,628.31 : x
  2. Step 2: Convert to fraction form
    718,915.61/992,096.70 = 396,628.31/x
  3. Step 3: Cross multiply
    718,915.61x = 992,096.70 × 396,628.31
  4. Step 4: Simplify right side
    718,915.61x = 393,493,637,477.58
  5. Step 5: Solve for x
    x = 393,493,637,477.58/718,915.61
  6. Step 6: Final answer
    x = 547,343.29

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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.