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Finding the Fourth Proportional to 53.46, 79.70 and 51.45

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Solution

The fourth proportional to 53.46, 79.70 and 51.45 is: 76.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.46 : 79.70 = 51.45 : x
  2. Step 2: Convert to fraction form
    53.46/79.70 = 51.45/x
  3. Step 3: Cross multiply
    53.46x = 79.70 × 51.45
  4. Step 4: Simplify right side
    53.46x = 4,100.57
  5. Step 5: Solve for x
    x = 4,100.57/53.46
  6. Step 6: Final answer
    x = 76.70

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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.