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Finding the Fourth Proportional to 85,019.80, 127,529.70 and 69,986.20

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Solution

The fourth proportional to 85,019.80, 127,529.70 and 69,986.20 is: 104,979.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,019.80 : 127,529.70 = 69,986.20 : x
  2. Step 2: Convert to fraction form
    85,019.80/127,529.70 = 69,986.20/x
  3. Step 3: Cross multiply
    85,019.80x = 127,529.70 × 69,986.20
  4. Step 4: Simplify right side
    85,019.80x = 8,925,319,090.14
  5. Step 5: Solve for x
    x = 8,925,319,090.14/85,019.80
  6. Step 6: Final answer
    x = 104,979.30

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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.