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Finding the Fourth Proportional to 102.42, 153.60 and 56.76

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Solution

The fourth proportional to 102.42, 153.60 and 56.76 is: 85.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.42 : 153.60 = 56.76 : x
  2. Step 2: Convert to fraction form
    102.42/153.60 = 56.76/x
  3. Step 3: Cross multiply
    102.42x = 153.60 × 56.76
  4. Step 4: Simplify right side
    102.42x = 8,718.34
  5. Step 5: Solve for x
    x = 8,718.34/102.42
  6. Step 6: Final answer
    x = 85.12

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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.