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Finding the Fourth Proportional to 904.38, 1,353.60 and 686.76

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Solution

The fourth proportional to 904.38, 1,353.60 and 686.76 is: 1,027.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.38 : 1,353.60 = 686.76 : x
  2. Step 2: Convert to fraction form
    904.38/1,353.60 = 686.76/x
  3. Step 3: Cross multiply
    904.38x = 1,353.60 × 686.76
  4. Step 4: Simplify right side
    904.38x = 929,598.34
  5. Step 5: Solve for x
    x = 929,598.34/904.38
  6. Step 6: Final answer
    x = 1,027.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.