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Finding the Fourth Proportional to 1,005.52, 1,389.02 and 956.92

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Solution

The fourth proportional to 1,005.52, 1,389.02 and 956.92 is: 1,321.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.52 : 1,389.02 = 956.92 : x
  2. Step 2: Convert to fraction form
    1,005.52/1,389.02 = 956.92/x
  3. Step 3: Cross multiply
    1,005.52x = 1,389.02 × 956.92
  4. Step 4: Simplify right side
    1,005.52x = 1,329,181.02
  5. Step 5: Solve for x
    x = 1,329,181.02/1,005.52
  6. Step 6: Final answer
    x = 1,321.88

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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.