Home / 85,230.12-128,029.50-72,108.84

Finding the Fourth Proportional to 85,230.12, 128,029.50 and 72,108.84

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Solution

The fourth proportional to 85,230.12, 128,029.50 and 72,108.84 is: 108,319.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,230.12 : 128,029.50 = 72,108.84 : x
  2. Step 2: Convert to fraction form
    85,230.12/128,029.50 = 72,108.84/x
  3. Step 3: Cross multiply
    85,230.12x = 128,029.50 × 72,108.84
  4. Step 4: Simplify right side
    85,230.12x = 9,232,058,730.78
  5. Step 5: Solve for x
    x = 9,232,058,730.78/85,230.12
  6. Step 6: Final answer
    x = 108,319.20

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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.