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Finding the Fourth Proportional to 75.05, 112.47 and 39.00

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Solution

The fourth proportional to 75.05, 112.47 and 39.00 is: 58.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.05 : 112.47 = 39.00 : x
  2. Step 2: Convert to fraction form
    75.05/112.47 = 39.00/x
  3. Step 3: Cross multiply
    75.05x = 112.47 × 39.00
  4. Step 4: Simplify right side
    75.05x = 4,386.61
  5. Step 5: Solve for x
    x = 4,386.61/75.05
  6. Step 6: Final answer
    x = 58.45

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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.