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Finding the Fourth Proportional to 58.28, 87.92 and 56.40

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Solution

The fourth proportional to 58.28, 87.92 and 56.40 is: 85.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.28 : 87.92 = 56.40 : x
  2. Step 2: Convert to fraction form
    58.28/87.92 = 56.40/x
  3. Step 3: Cross multiply
    58.28x = 87.92 × 56.40
  4. Step 4: Simplify right side
    58.28x = 4,958.69
  5. Step 5: Solve for x
    x = 4,958.69/58.28
  6. Step 6: Final answer
    x = 85.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.