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Finding the Fourth Proportional to 56.43, 78.23 and 55.58

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Solution

The fourth proportional to 56.43, 78.23 and 55.58 is: 77.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.43 : 78.23 = 55.58 : x
  2. Step 2: Convert to fraction form
    56.43/78.23 = 55.58/x
  3. Step 3: Cross multiply
    56.43x = 78.23 × 55.58
  4. Step 4: Simplify right side
    56.43x = 4,347.77
  5. Step 5: Solve for x
    x = 4,347.77/56.43
  6. Step 6: Final answer
    x = 77.05

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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.