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Finding the Fourth Proportional to 66.28, 99.70 and 56.84

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Solution

The fourth proportional to 66.28, 99.70 and 56.84 is: 85.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.28 : 99.70 = 56.84 : x
  2. Step 2: Convert to fraction form
    66.28/99.70 = 56.84/x
  3. Step 3: Cross multiply
    66.28x = 99.70 × 56.84
  4. Step 4: Simplify right side
    66.28x = 5,666.95
  5. Step 5: Solve for x
    x = 5,666.95/66.28
  6. Step 6: Final answer
    x = 85.50

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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.