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Finding the Fourth Proportional to 710,040.28, 979,818.90 and 387,688.12

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Solution

The fourth proportional to 710,040.28, 979,818.90 and 387,688.12 is: 534,989.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,040.28 : 979,818.90 = 387,688.12 : x
  2. Step 2: Convert to fraction form
    710,040.28/979,818.90 = 387,688.12/x
  3. Step 3: Cross multiply
    710,040.28x = 979,818.90 × 387,688.12
  4. Step 4: Simplify right side
    710,040.28x = 379,864,147,281.47
  5. Step 5: Solve for x
    x = 379,864,147,281.47/710,040.28
  6. Step 6: Final answer
    x = 534,989.57

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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.