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Finding the Fourth Proportional to 58.50, 87.76 and 28.05

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Solution

The fourth proportional to 58.50, 87.76 and 28.05 is: 42.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.50 : 87.76 = 28.05 : x
  2. Step 2: Convert to fraction form
    58.50/87.76 = 28.05/x
  3. Step 3: Cross multiply
    58.50x = 87.76 × 28.05
  4. Step 4: Simplify right side
    58.50x = 2,461.30
  5. Step 5: Solve for x
    x = 2,461.30/58.50
  6. Step 6: Final answer
    x = 42.08

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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.