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Finding the Fourth Proportional to 42.54, 58.70 and 28.77

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Solution

The fourth proportional to 42.54, 58.70 and 28.77 is: 39.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.54 : 58.70 = 28.77 : x
  2. Step 2: Convert to fraction form
    42.54/58.70 = 28.77/x
  3. Step 3: Cross multiply
    42.54x = 58.70 × 28.77
  4. Step 4: Simplify right side
    42.54x = 1,688.66
  5. Step 5: Solve for x
    x = 1,688.66/42.54
  6. Step 6: Final answer
    x = 39.70

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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.