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Finding the Fourth Proportional to 60.48, 83.40 and 47.40

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Solution

The fourth proportional to 60.48, 83.40 and 47.40 is: 65.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.48 : 83.40 = 47.40 : x
  2. Step 2: Convert to fraction form
    60.48/83.40 = 47.40/x
  3. Step 3: Cross multiply
    60.48x = 83.40 × 47.40
  4. Step 4: Simplify right side
    60.48x = 3,953.16
  5. Step 5: Solve for x
    x = 3,953.16/60.48
  6. Step 6: Final answer
    x = 65.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.