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Finding the Fourth Proportional to 180.40, 247.58 and 172.72

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Solution

The fourth proportional to 180.40, 247.58 and 172.72 is: 237.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.40 : 247.58 = 172.72 : x
  2. Step 2: Convert to fraction form
    180.40/247.58 = 172.72/x
  3. Step 3: Cross multiply
    180.40x = 247.58 × 172.72
  4. Step 4: Simplify right side
    180.40x = 42,762.02
  5. Step 5: Solve for x
    x = 42,762.02/180.40
  6. Step 6: Final answer
    x = 237.04

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.