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Finding the Fourth Proportional to 72.04, 99.84 and 70

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Solution

The fourth proportional to 72.04, 99.84 and 70 is: 97.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.04 : 99.84 = 70 : x
  2. Step 2: Convert to fraction form
    72.04/99.84 = 70/x
  3. Step 3: Cross multiply
    72.04x = 99.84 × 70
  4. Step 4: Simplify right side
    72.04x = 6,988.80
  5. Step 5: Solve for x
    x = 6,988.80/72.04
  6. Step 6: Final answer
    x = 97.01

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.