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Finding the Fourth Proportional to 72.13, 99.57 and 70.18

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Solution

The fourth proportional to 72.13, 99.57 and 70.18 is: 96.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.13 : 99.57 = 70.18 : x
  2. Step 2: Convert to fraction form
    72.13/99.57 = 70.18/x
  3. Step 3: Cross multiply
    72.13x = 99.57 × 70.18
  4. Step 4: Simplify right side
    72.13x = 6,987.82
  5. Step 5: Solve for x
    x = 6,987.82/72.13
  6. Step 6: Final answer
    x = 96.88

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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.