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Finding the Fourth Proportional to 719,108.81, 992,363.90 and 392,428.28

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Solution

The fourth proportional to 719,108.81, 992,363.90 and 392,428.28 is: 541,547.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,108.81 : 992,363.90 = 392,428.28 : x
  2. Step 2: Convert to fraction form
    719,108.81/992,363.90 = 392,428.28/x
  3. Step 3: Cross multiply
    719,108.81x = 992,363.90 × 392,428.28
  4. Step 4: Simplify right side
    719,108.81x = 389,431,658,411.09
  5. Step 5: Solve for x
    x = 389,431,658,411.09/719,108.81
  6. Step 6: Final answer
    x = 541,547.61

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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.