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Finding the Fourth Proportional to 72.21, 99.57 and 51.47

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Solution

The fourth proportional to 72.21, 99.57 and 51.47 is: 70.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.21 : 99.57 = 51.47 : x
  2. Step 2: Convert to fraction form
    72.21/99.57 = 51.47/x
  3. Step 3: Cross multiply
    72.21x = 99.57 × 51.47
  4. Step 4: Simplify right side
    72.21x = 5,125.11
  5. Step 5: Solve for x
    x = 5,125.11/72.21
  6. Step 6: Final answer
    x = 70.98

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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.