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Finding the Fourth Proportional to 157.40, 236.10 and 49.20

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Solution

The fourth proportional to 157.40, 236.10 and 49.20 is: 73.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.40 : 236.10 = 49.20 : x
  2. Step 2: Convert to fraction form
    157.40/236.10 = 49.20/x
  3. Step 3: Cross multiply
    157.40x = 236.10 × 49.20
  4. Step 4: Simplify right side
    157.40x = 11,616.12
  5. Step 5: Solve for x
    x = 11,616.12/157.40
  6. Step 6: Final answer
    x = 73.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.