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Finding the Fourth Proportional to 56.40, 77.28 and 56.04

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Solution

The fourth proportional to 56.40, 77.28 and 56.04 is: 76.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.40 : 77.28 = 56.04 : x
  2. Step 2: Convert to fraction form
    56.40/77.28 = 56.04/x
  3. Step 3: Cross multiply
    56.40x = 77.28 × 56.04
  4. Step 4: Simplify right side
    56.40x = 4,330.77
  5. Step 5: Solve for x
    x = 4,330.77/56.40
  6. Step 6: Final answer
    x = 76.79

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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.