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Finding the Fourth Proportional to 1,129.40, 1,691.16 and 909.02

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Solution

The fourth proportional to 1,129.40, 1,691.16 and 909.02 is: 1,361.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.40 : 1,691.16 = 909.02 : x
  2. Step 2: Convert to fraction form
    1,129.40/1,691.16 = 909.02/x
  3. Step 3: Cross multiply
    1,129.40x = 1,691.16 × 909.02
  4. Step 4: Simplify right side
    1,129.40x = 1,537,298.26
  5. Step 5: Solve for x
    x = 1,537,298.26/1,129.40
  6. Step 6: Final answer
    x = 1,361.16

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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.