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Finding the Fourth Proportional to 72.99, 100.65 and 65.22

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Solution

The fourth proportional to 72.99, 100.65 and 65.22 is: 89.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.99 : 100.65 = 65.22 : x
  2. Step 2: Convert to fraction form
    72.99/100.65 = 65.22/x
  3. Step 3: Cross multiply
    72.99x = 100.65 × 65.22
  4. Step 4: Simplify right side
    72.99x = 6,564.26
  5. Step 5: Solve for x
    x = 6,564.26/72.99
  6. Step 6: Final answer
    x = 89.93

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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.