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Finding the Fourth Proportional to 99.60, 149.31 and 56.28

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Solution

The fourth proportional to 99.60, 149.31 and 56.28 is: 84.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.60 : 149.31 = 56.28 : x
  2. Step 2: Convert to fraction form
    99.60/149.31 = 56.28/x
  3. Step 3: Cross multiply
    99.60x = 149.31 × 56.28
  4. Step 4: Simplify right side
    99.60x = 8,403.17
  5. Step 5: Solve for x
    x = 8,403.17/99.60
  6. Step 6: Final answer
    x = 84.37

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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.