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Finding the Fourth Proportional to 1,006.43, 1,389.16 and 707.75

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Solution

The fourth proportional to 1,006.43, 1,389.16 and 707.75 is: 976.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.43 : 1,389.16 = 707.75 : x
  2. Step 2: Convert to fraction form
    1,006.43/1,389.16 = 707.75/x
  3. Step 3: Cross multiply
    1,006.43x = 1,389.16 × 707.75
  4. Step 4: Simplify right side
    1,006.43x = 983,177.99
  5. Step 5: Solve for x
    x = 983,177.99/1,006.43
  6. Step 6: Final answer
    x = 976.90

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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.