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Finding the Fourth Proportional to 57.04, 78.76 and 40.64

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Solution

The fourth proportional to 57.04, 78.76 and 40.64 is: 56.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.04 : 78.76 = 40.64 : x
  2. Step 2: Convert to fraction form
    57.04/78.76 = 40.64/x
  3. Step 3: Cross multiply
    57.04x = 78.76 × 40.64
  4. Step 4: Simplify right side
    57.04x = 3,200.81
  5. Step 5: Solve for x
    x = 3,200.81/57.04
  6. Step 6: Final answer
    x = 56.12

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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.