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Finding the Fourth Proportional to 929.27, 1,394.57 and 686.45

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Solution

The fourth proportional to 929.27, 1,394.57 and 686.45 is: 1,030.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.27 : 1,394.57 = 686.45 : x
  2. Step 2: Convert to fraction form
    929.27/1,394.57 = 686.45/x
  3. Step 3: Cross multiply
    929.27x = 1,394.57 × 686.45
  4. Step 4: Simplify right side
    929.27x = 957,302.58
  5. Step 5: Solve for x
    x = 957,302.58/929.27
  6. Step 6: Final answer
    x = 1,030.17

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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.