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Finding the Fourth Proportional to 1,006.62, 1,387.95 and 931.98

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Solution

The fourth proportional to 1,006.62, 1,387.95 and 931.98 is: 1,285.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.62 : 1,387.95 = 931.98 : x
  2. Step 2: Convert to fraction form
    1,006.62/1,387.95 = 931.98/x
  3. Step 3: Cross multiply
    1,006.62x = 1,387.95 × 931.98
  4. Step 4: Simplify right side
    1,006.62x = 1,293,541.64
  5. Step 5: Solve for x
    x = 1,293,541.64/1,006.62
  6. Step 6: Final answer
    x = 1,285.03

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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.