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Finding the Fourth Proportional to 1,159.83, 1,740.39 and 429.90

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Solution

The fourth proportional to 1,159.83, 1,740.39 and 429.90 is: 645.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159.83 : 1,740.39 = 429.90 : x
  2. Step 2: Convert to fraction form
    1,159.83/1,740.39 = 429.90/x
  3. Step 3: Cross multiply
    1,159.83x = 1,740.39 × 429.90
  4. Step 4: Simplify right side
    1,159.83x = 748,193.66
  5. Step 5: Solve for x
    x = 748,193.66/1,159.83
  6. Step 6: Final answer
    x = 645.09

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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.