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Finding the Fourth Proportional to 58.24, 87.20 and 53.20

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Solution

The fourth proportional to 58.24, 87.20 and 53.20 is: 79.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.24 : 87.20 = 53.20 : x
  2. Step 2: Convert to fraction form
    58.24/87.20 = 53.20/x
  3. Step 3: Cross multiply
    58.24x = 87.20 × 53.20
  4. Step 4: Simplify right side
    58.24x = 4,639.04
  5. Step 5: Solve for x
    x = 4,639.04/58.24
  6. Step 6: Final answer
    x = 79.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.