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Finding the Fourth Proportional to 58.80, 88.60 and 55.20

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Solution

The fourth proportional to 58.80, 88.60 and 55.20 is: 83.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.80 : 88.60 = 55.20 : x
  2. Step 2: Convert to fraction form
    58.80/88.60 = 55.20/x
  3. Step 3: Cross multiply
    58.80x = 88.60 × 55.20
  4. Step 4: Simplify right side
    58.80x = 4,890.72
  5. Step 5: Solve for x
    x = 4,890.72/58.80
  6. Step 6: Final answer
    x = 83.18

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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.