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Finding the Fourth Proportional to 66.02, 91.12 and 38.40

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Solution

The fourth proportional to 66.02, 91.12 and 38.40 is: 53.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.02 : 91.12 = 38.40 : x
  2. Step 2: Convert to fraction form
    66.02/91.12 = 38.40/x
  3. Step 3: Cross multiply
    66.02x = 91.12 × 38.40
  4. Step 4: Simplify right side
    66.02x = 3,499.01
  5. Step 5: Solve for x
    x = 3,499.01/66.02
  6. Step 6: Final answer
    x = 53.00

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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.