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Finding the Fourth Proportional to 89,612.64, 123,660 and 51,879.60

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Solution

The fourth proportional to 89,612.64, 123,660 and 51,879.60 is: 71,590.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,612.64 : 123,660 = 51,879.60 : x
  2. Step 2: Convert to fraction form
    89,612.64/123,660 = 51,879.60/x
  3. Step 3: Cross multiply
    89,612.64x = 123,660 × 51,879.60
  4. Step 4: Simplify right side
    89,612.64x = 6,415,431,336
  5. Step 5: Solve for x
    x = 6,415,431,336/89,612.64
  6. Step 6: Final answer
    x = 71,590.70

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1.5x scale

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.