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Finding the Fourth Proportional to 1,005.96, 1,387.89 and 711.12

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Solution

The fourth proportional to 1,005.96, 1,387.89 and 711.12 is: 981.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.96 : 1,387.89 = 711.12 : x
  2. Step 2: Convert to fraction form
    1,005.96/1,387.89 = 711.12/x
  3. Step 3: Cross multiply
    1,005.96x = 1,387.89 × 711.12
  4. Step 4: Simplify right side
    1,005.96x = 986,956.34
  5. Step 5: Solve for x
    x = 986,956.34/1,005.96
  6. Step 6: Final answer
    x = 981.11

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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.