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Finding the Fourth Proportional to 60.29, 90.45 and 45.20

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Solution

The fourth proportional to 60.29, 90.45 and 45.20 is: 67.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.29 : 90.45 = 45.20 : x
  2. Step 2: Convert to fraction form
    60.29/90.45 = 45.20/x
  3. Step 3: Cross multiply
    60.29x = 90.45 × 45.20
  4. Step 4: Simplify right side
    60.29x = 4,088.34
  5. Step 5: Solve for x
    x = 4,088.34/60.29
  6. Step 6: Final answer
    x = 67.81

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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.