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Finding the Fourth Proportional to 1,138.20, 1,708.40 and 590.76

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Solution

The fourth proportional to 1,138.20, 1,708.40 and 590.76 is: 886.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.20 : 1,708.40 = 590.76 : x
  2. Step 2: Convert to fraction form
    1,138.20/1,708.40 = 590.76/x
  3. Step 3: Cross multiply
    1,138.20x = 1,708.40 × 590.76
  4. Step 4: Simplify right side
    1,138.20x = 1,009,254.38
  5. Step 5: Solve for x
    x = 1,009,254.38/1,138.20
  6. Step 6: Final answer
    x = 886.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.