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Finding the Fourth Proportional to 56.93, 78.61 and 40.58

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Solution

The fourth proportional to 56.93, 78.61 and 40.58 is: 56.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.93 : 78.61 = 40.58 : x
  2. Step 2: Convert to fraction form
    56.93/78.61 = 40.58/x
  3. Step 3: Cross multiply
    56.93x = 78.61 × 40.58
  4. Step 4: Simplify right side
    56.93x = 3,189.50
  5. Step 5: Solve for x
    x = 3,189.50/56.93
  6. Step 6: Final answer
    x = 56.02

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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.