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Finding the Fourth Proportional to 85,978.10, 128,979.30 and 26,807.60

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Solution

The fourth proportional to 85,978.10, 128,979.30 and 26,807.60 is: 40,215.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,978.10 : 128,979.30 = 26,807.60 : x
  2. Step 2: Convert to fraction form
    85,978.10/128,979.30 = 26,807.60/x
  3. Step 3: Cross multiply
    85,978.10x = 128,979.30 × 26,807.60
  4. Step 4: Simplify right side
    85,978.10x = 3,457,625,482.68
  5. Step 5: Solve for x
    x = 3,457,625,482.68/85,978.10
  6. Step 6: Final answer
    x = 40,215.19

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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.