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Finding the Fourth Proportional to 48.84, 72.87 and 45

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Solution

The fourth proportional to 48.84, 72.87 and 45 is: 67.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.84 : 72.87 = 45 : x
  2. Step 2: Convert to fraction form
    48.84/72.87 = 45/x
  3. Step 3: Cross multiply
    48.84x = 72.87 × 45
  4. Step 4: Simplify right side
    48.84x = 3,279.15
  5. Step 5: Solve for x
    x = 3,279.15/48.84
  6. Step 6: Final answer
    x = 67.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.