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Finding the Fourth Proportional to 74.28, 102.50 and 65.07

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Solution

The fourth proportional to 74.28, 102.50 and 65.07 is: 89.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.28 : 102.50 = 65.07 : x
  2. Step 2: Convert to fraction form
    74.28/102.50 = 65.07/x
  3. Step 3: Cross multiply
    74.28x = 102.50 × 65.07
  4. Step 4: Simplify right side
    74.28x = 6,669.68
  5. Step 5: Solve for x
    x = 6,669.68/74.28
  6. Step 6: Final answer
    x = 89.79

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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.