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Finding the Fourth Proportional to 1,129.90, 1,685.71 and 1,006.78

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Solution

The fourth proportional to 1,129.90, 1,685.71 and 1,006.78 is: 1,502.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.90 : 1,685.71 = 1,006.78 : x
  2. Step 2: Convert to fraction form
    1,129.90/1,685.71 = 1,006.78/x
  3. Step 3: Cross multiply
    1,129.90x = 1,685.71 × 1,006.78
  4. Step 4: Simplify right side
    1,129.90x = 1,697,139.11
  5. Step 5: Solve for x
    x = 1,697,139.11/1,129.90
  6. Step 6: Final answer
    x = 1,502.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.