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Finding the Fourth Proportional to 56.95, 78.60 and 32.40

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Solution

The fourth proportional to 56.95, 78.60 and 32.40 is: 44.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.95 : 78.60 = 32.40 : x
  2. Step 2: Convert to fraction form
    56.95/78.60 = 32.40/x
  3. Step 3: Cross multiply
    56.95x = 78.60 × 32.40
  4. Step 4: Simplify right side
    56.95x = 2,546.49
  5. Step 5: Solve for x
    x = 2,546.49/56.95
  6. Step 6: Final answer
    x = 44.71

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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.