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Finding the Fourth Proportional to 716,859.15, 989,257.80 and 394,562.31

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Solution

The fourth proportional to 716,859.15, 989,257.80 and 394,562.31 is: 544,491.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,859.15 : 989,257.80 = 394,562.31 : x
  2. Step 2: Convert to fraction form
    716,859.15/989,257.80 = 394,562.31/x
  3. Step 3: Cross multiply
    716,859.15x = 989,257.80 × 394,562.31
  4. Step 4: Simplify right side
    716,859.15x = 390,323,842,753.52
  5. Step 5: Solve for x
    x = 390,323,842,753.52/716,859.15
  6. Step 6: Final answer
    x = 544,491.68

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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.