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Finding the Fourth Proportional to 716,154.52, 988,318.06 and 393,889

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Solution

The fourth proportional to 716,154.52, 988,318.06 and 393,889 is: 543,580.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,154.52 : 988,318.06 = 393,889 : x
  2. Step 2: Convert to fraction form
    716,154.52/988,318.06 = 393,889/x
  3. Step 3: Cross multiply
    716,154.52x = 988,318.06 × 393,889
  4. Step 4: Simplify right side
    716,154.52x = 389,287,612,335.34
  5. Step 5: Solve for x
    x = 389,287,612,335.34/716,154.52
  6. Step 6: Final answer
    x = 543,580.47

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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.