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Finding the Fourth Proportional to 86,947.20, 130,420.80 and 85,780.80

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Solution

The fourth proportional to 86,947.20, 130,420.80 and 85,780.80 is: 128,671.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,947.20 : 130,420.80 = 85,780.80 : x
  2. Step 2: Convert to fraction form
    86,947.20/130,420.80 = 85,780.80/x
  3. Step 3: Cross multiply
    86,947.20x = 130,420.80 × 85,780.80
  4. Step 4: Simplify right side
    86,947.20x = 11,187,600,560.64
  5. Step 5: Solve for x
    x = 11,187,600,560.64/86,947.20
  6. Step 6: Final answer
    x = 128,671.20

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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.