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Finding the Fourth Proportional to 929.04, 1,394.20 and 686.20

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Solution

The fourth proportional to 929.04, 1,394.20 and 686.20 is: 1,029.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.04 : 1,394.20 = 686.20 : x
  2. Step 2: Convert to fraction form
    929.04/1,394.20 = 686.20/x
  3. Step 3: Cross multiply
    929.04x = 1,394.20 × 686.20
  4. Step 4: Simplify right side
    929.04x = 956,700.04
  5. Step 5: Solve for x
    x = 956,700.04/929.04
  6. Step 6: Final answer
    x = 1,029.77

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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.