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Finding the Fourth Proportional to 54.86, 75.65 and 42.39

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Solution

The fourth proportional to 54.86, 75.65 and 42.39 is: 58.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.86 : 75.65 = 42.39 : x
  2. Step 2: Convert to fraction form
    54.86/75.65 = 42.39/x
  3. Step 3: Cross multiply
    54.86x = 75.65 × 42.39
  4. Step 4: Simplify right side
    54.86x = 3,206.61
  5. Step 5: Solve for x
    x = 3,206.61/54.86
  6. Step 6: Final answer
    x = 58.45

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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.