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Finding the Fourth Proportional to 1,006.38, 1,389.08 and 657

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Solution

The fourth proportional to 1,006.38, 1,389.08 and 657 is: 906.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.38 : 1,389.08 = 657 : x
  2. Step 2: Convert to fraction form
    1,006.38/1,389.08 = 657/x
  3. Step 3: Cross multiply
    1,006.38x = 1,389.08 × 657
  4. Step 4: Simplify right side
    1,006.38x = 912,625.56
  5. Step 5: Solve for x
    x = 912,625.56/1,006.38
  6. Step 6: Final answer
    x = 906.84

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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.