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Finding the Fourth Proportional to 58.80, 87.80 and 56.40

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Solution

The fourth proportional to 58.80, 87.80 and 56.40 is: 84.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.80 : 87.80 = 56.40 : x
  2. Step 2: Convert to fraction form
    58.80/87.80 = 56.40/x
  3. Step 3: Cross multiply
    58.80x = 87.80 × 56.40
  4. Step 4: Simplify right side
    58.80x = 4,951.92
  5. Step 5: Solve for x
    x = 4,951.92/58.80
  6. Step 6: Final answer
    x = 84.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.