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Finding the Fourth Proportional to 66.02, 90.65 and 53.53

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Solution

The fourth proportional to 66.02, 90.65 and 53.53 is: 73.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.02 : 90.65 = 53.53 : x
  2. Step 2: Convert to fraction form
    66.02/90.65 = 53.53/x
  3. Step 3: Cross multiply
    66.02x = 90.65 × 53.53
  4. Step 4: Simplify right side
    66.02x = 4,852.40
  5. Step 5: Solve for x
    x = 4,852.40/66.02
  6. Step 6: Final answer
    x = 73.50

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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.