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Finding the Fourth Proportional to 72.59, 99.64 and 64.22

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Solution

The fourth proportional to 72.59, 99.64 and 64.22 is: 88.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.59 : 99.64 = 64.22 : x
  2. Step 2: Convert to fraction form
    72.59/99.64 = 64.22/x
  3. Step 3: Cross multiply
    72.59x = 99.64 × 64.22
  4. Step 4: Simplify right side
    72.59x = 6,398.88
  5. Step 5: Solve for x
    x = 6,398.88/72.59
  6. Step 6: Final answer
    x = 88.15

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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.