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Finding the Fourth Proportional to 74.30, 102.51 and 61.28

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Solution

The fourth proportional to 74.30, 102.51 and 61.28 is: 84.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.30 : 102.51 = 61.28 : x
  2. Step 2: Convert to fraction form
    74.30/102.51 = 61.28/x
  3. Step 3: Cross multiply
    74.30x = 102.51 × 61.28
  4. Step 4: Simplify right side
    74.30x = 6,281.81
  5. Step 5: Solve for x
    x = 6,281.81/74.30
  6. Step 6: Final answer
    x = 84.55

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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.