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Finding the Fourth Proportional to 89.45, 123.37 and 56.70

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Solution

The fourth proportional to 89.45, 123.37 and 56.70 is: 78.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.45 : 123.37 = 56.70 : x
  2. Step 2: Convert to fraction form
    89.45/123.37 = 56.70/x
  3. Step 3: Cross multiply
    89.45x = 123.37 × 56.70
  4. Step 4: Simplify right side
    89.45x = 6,995.08
  5. Step 5: Solve for x
    x = 6,995.08/89.45
  6. Step 6: Final answer
    x = 78.20

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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.