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Finding the Fourth Proportional to 66.04, 90.57 and 63.56

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Solution

The fourth proportional to 66.04, 90.57 and 63.56 is: 87.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.04 : 90.57 = 63.56 : x
  2. Step 2: Convert to fraction form
    66.04/90.57 = 63.56/x
  3. Step 3: Cross multiply
    66.04x = 90.57 × 63.56
  4. Step 4: Simplify right side
    66.04x = 5,756.63
  5. Step 5: Solve for x
    x = 5,756.63/66.04
  6. Step 6: Final answer
    x = 87.17

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.