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Finding the Fourth Proportional to 716,651.34, 988,966.31 and 389,953.32

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Solution

The fourth proportional to 716,651.34, 988,966.31 and 389,953.32 is: 538,128.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,651.34 : 988,966.31 = 389,953.32 : x
  2. Step 2: Convert to fraction form
    716,651.34/988,966.31 = 389,953.32/x
  3. Step 3: Cross multiply
    716,651.34x = 988,966.31 × 389,953.32
  4. Step 4: Simplify right side
    716,651.34x = 385,650,694,002.88
  5. Step 5: Solve for x
    x = 385,650,694,002.88/716,651.34
  6. Step 6: Final answer
    x = 538,128.76

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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.