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Finding the Fourth Proportional to 58.19, 87.17 and 45.28

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Solution

The fourth proportional to 58.19, 87.17 and 45.28 is: 67.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.19 : 87.17 = 45.28 : x
  2. Step 2: Convert to fraction form
    58.19/87.17 = 45.28/x
  3. Step 3: Cross multiply
    58.19x = 87.17 × 45.28
  4. Step 4: Simplify right side
    58.19x = 3,946.40
  5. Step 5: Solve for x
    x = 3,946.40/58.19
  6. Step 6: Final answer
    x = 67.82

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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.