Home / 85,979.10-128,968.65-77,231.10

Finding the Fourth Proportional to 85,979.10, 128,968.65 and 77,231.10

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Solution

The fourth proportional to 85,979.10, 128,968.65 and 77,231.10 is: 115,846.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,979.10 : 128,968.65 = 77,231.10 : x
  2. Step 2: Convert to fraction form
    85,979.10/128,968.65 = 77,231.10/x
  3. Step 3: Cross multiply
    85,979.10x = 128,968.65 × 77,231.10
  4. Step 4: Simplify right side
    85,979.10x = 9,960,390,705.02
  5. Step 5: Solve for x
    x = 9,960,390,705.02/85,979.10
  6. Step 6: Final answer
    x = 115,846.65

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.