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Finding the Fourth Proportional to 87.98, 121.43 and 53.01

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Solution

The fourth proportional to 87.98, 121.43 and 53.01 is: 73.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.98 : 121.43 = 53.01 : x
  2. Step 2: Convert to fraction form
    87.98/121.43 = 53.01/x
  3. Step 3: Cross multiply
    87.98x = 121.43 × 53.01
  4. Step 4: Simplify right side
    87.98x = 6,437.00
  5. Step 5: Solve for x
    x = 6,437.00/87.98
  6. Step 6: Final answer
    x = 73.16

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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.