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Finding the Fourth Proportional to 716,654.34, 988,970.44 and 389,956.32

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Solution

The fourth proportional to 716,654.34, 988,970.44 and 389,956.32 is: 538,132.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,654.34 : 988,970.44 = 389,956.32 : x
  2. Step 2: Convert to fraction form
    716,654.34/988,970.44 = 389,956.32/x
  3. Step 3: Cross multiply
    716,654.34x = 988,970.44 × 389,956.32
  4. Step 4: Simplify right side
    716,654.34x = 385,655,273,371.18
  5. Step 5: Solve for x
    x = 385,655,273,371.18/716,654.34
  6. Step 6: Final answer
    x = 538,132.89

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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.