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Finding the Fourth Proportional to 51.13, 70.49 and 42.40

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Solution

The fourth proportional to 51.13, 70.49 and 42.40 is: 58.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.13 : 70.49 = 42.40 : x
  2. Step 2: Convert to fraction form
    51.13/70.49 = 42.40/x
  3. Step 3: Cross multiply
    51.13x = 70.49 × 42.40
  4. Step 4: Simplify right side
    51.13x = 2,988.78
  5. Step 5: Solve for x
    x = 2,988.78/51.13
  6. Step 6: Final answer
    x = 58.45

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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.