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Finding the Fourth Proportional to 56.70, 78.62 and 53.46

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Solution

The fourth proportional to 56.70, 78.62 and 53.46 is: 74.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.70 : 78.62 = 53.46 : x
  2. Step 2: Convert to fraction form
    56.70/78.62 = 53.46/x
  3. Step 3: Cross multiply
    56.70x = 78.62 × 53.46
  4. Step 4: Simplify right side
    56.70x = 4,202.76
  5. Step 5: Solve for x
    x = 4,202.76/56.70
  6. Step 6: Final answer
    x = 74.12

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.