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Finding the Fourth Proportional to 124.98, 172.50 and 88.20

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Solution

The fourth proportional to 124.98, 172.50 and 88.20 is: 121.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.98 : 172.50 = 88.20 : x
  2. Step 2: Convert to fraction form
    124.98/172.50 = 88.20/x
  3. Step 3: Cross multiply
    124.98x = 172.50 × 88.20
  4. Step 4: Simplify right side
    124.98x = 15,214.50
  5. Step 5: Solve for x
    x = 15,214.50/124.98
  6. Step 6: Final answer
    x = 121.74

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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.