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Finding the Fourth Proportional to 1,130.89, 1,691.80 and 978.46

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Solution

The fourth proportional to 1,130.89, 1,691.80 and 978.46 is: 1,463.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.89 : 1,691.80 = 978.46 : x
  2. Step 2: Convert to fraction form
    1,130.89/1,691.80 = 978.46/x
  3. Step 3: Cross multiply
    1,130.89x = 1,691.80 × 978.46
  4. Step 4: Simplify right side
    1,130.89x = 1,655,358.63
  5. Step 5: Solve for x
    x = 1,655,358.63/1,130.89
  6. Step 6: Final answer
    x = 1,463.77

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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.