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Finding the Fourth Proportional to 85,800.56, 128,673.16 and 80,203.20

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Solution

The fourth proportional to 85,800.56, 128,673.16 and 80,203.20 is: 120,278.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,800.56 : 128,673.16 = 80,203.20 : x
  2. Step 2: Convert to fraction form
    85,800.56/128,673.16 = 80,203.20/x
  3. Step 3: Cross multiply
    85,800.56x = 128,673.16 × 80,203.20
  4. Step 4: Simplify right side
    85,800.56x = 10,319,999,186.11
  5. Step 5: Solve for x
    x = 10,319,999,186.11/85,800.56
  6. Step 6: Final answer
    x = 120,278.93

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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.