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Finding the Fourth Proportional to 85,020.80, 127,531.20 and 69,987.20

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Solution

The fourth proportional to 85,020.80, 127,531.20 and 69,987.20 is: 104,980.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,020.80 : 127,531.20 = 69,987.20 : x
  2. Step 2: Convert to fraction form
    85,020.80/127,531.20 = 69,987.20/x
  3. Step 3: Cross multiply
    85,020.80x = 127,531.20 × 69,987.20
  4. Step 4: Simplify right side
    85,020.80x = 8,925,551,600.64
  5. Step 5: Solve for x
    x = 8,925,551,600.64/85,020.80
  6. Step 6: Final answer
    x = 104,980.80

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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.