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Finding the Fourth Proportional to 42.60, 58.80 and 29.64

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Solution

The fourth proportional to 42.60, 58.80 and 29.64 is: 40.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.60 : 58.80 = 29.64 : x
  2. Step 2: Convert to fraction form
    42.60/58.80 = 29.64/x
  3. Step 3: Cross multiply
    42.60x = 58.80 × 29.64
  4. Step 4: Simplify right side
    42.60x = 1,742.83
  5. Step 5: Solve for x
    x = 1,742.83/42.60
  6. Step 6: Final answer
    x = 40.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.