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Finding the Fourth Proportional to 147.51, 220.95 and 66.15

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Solution

The fourth proportional to 147.51, 220.95 and 66.15 is: 99.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.51 : 220.95 = 66.15 : x
  2. Step 2: Convert to fraction form
    147.51/220.95 = 66.15/x
  3. Step 3: Cross multiply
    147.51x = 220.95 × 66.15
  4. Step 4: Simplify right side
    147.51x = 14,615.84
  5. Step 5: Solve for x
    x = 14,615.84/147.51
  6. Step 6: Final answer
    x = 99.08

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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.