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Finding the Fourth Proportional to 954.90, 1,434.05 and 781.89

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Solution

The fourth proportional to 954.90, 1,434.05 and 781.89 is: 1,174.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.90 : 1,434.05 = 781.89 : x
  2. Step 2: Convert to fraction form
    954.90/1,434.05 = 781.89/x
  3. Step 3: Cross multiply
    954.90x = 1,434.05 × 781.89
  4. Step 4: Simplify right side
    954.90x = 1,121,273.75
  5. Step 5: Solve for x
    x = 1,121,273.75/954.90
  6. Step 6: Final answer
    x = 1,174.24

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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.