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Finding the Fourth Proportional to 85,979.55, 128,987.55 and 26,003.10

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Solution

The fourth proportional to 85,979.55, 128,987.55 and 26,003.10 is: 39,010.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,979.55 : 128,987.55 = 26,003.10 : x
  2. Step 2: Convert to fraction form
    85,979.55/128,987.55 = 26,003.10/x
  3. Step 3: Cross multiply
    85,979.55x = 128,987.55 × 26,003.10
  4. Step 4: Simplify right side
    85,979.55x = 3,354,076,161.41
  5. Step 5: Solve for x
    x = 3,354,076,161.41/85,979.55
  6. Step 6: Final answer
    x = 39,010.16

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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.