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Finding the Fourth Proportional to 85,875.20, 128,812.80 and 80,043.20

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Solution

The fourth proportional to 85,875.20, 128,812.80 and 80,043.20 is: 120,064.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,875.20 : 128,812.80 = 80,043.20 : x
  2. Step 2: Convert to fraction form
    85,875.20/128,812.80 = 80,043.20/x
  3. Step 3: Cross multiply
    85,875.20x = 128,812.80 × 80,043.20
  4. Step 4: Simplify right side
    85,875.20x = 10,310,588,712.96
  5. Step 5: Solve for x
    x = 10,310,588,712.96/85,875.20
  6. Step 6: Final answer
    x = 120,064.80

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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.