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Finding the Fourth Proportional to 1,129.40, 1,693.82 and 307.68

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Solution

The fourth proportional to 1,129.40, 1,693.82 and 307.68 is: 461.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.40 : 1,693.82 = 307.68 : x
  2. Step 2: Convert to fraction form
    1,129.40/1,693.82 = 307.68/x
  3. Step 3: Cross multiply
    1,129.40x = 1,693.82 × 307.68
  4. Step 4: Simplify right side
    1,129.40x = 521,148.95
  5. Step 5: Solve for x
    x = 521,148.95/1,129.40
  6. Step 6: Final answer
    x = 461.44

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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.