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Finding the Fourth Proportional to 124.98, 172.45 and 72.51

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Solution

The fourth proportional to 124.98, 172.45 and 72.51 is: 100.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.98 : 172.45 = 72.51 : x
  2. Step 2: Convert to fraction form
    124.98/172.45 = 72.51/x
  3. Step 3: Cross multiply
    124.98x = 172.45 × 72.51
  4. Step 4: Simplify right side
    124.98x = 12,503.99
  5. Step 5: Solve for x
    x = 12,503.99/124.98
  6. Step 6: Final answer
    x = 100.05

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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.