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Finding the Fourth Proportional to 85,363.60, 128,045.40 and 80,525.20

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Solution

The fourth proportional to 85,363.60, 128,045.40 and 80,525.20 is: 120,787.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,363.60 : 128,045.40 = 80,525.20 : x
  2. Step 2: Convert to fraction form
    85,363.60/128,045.40 = 80,525.20/x
  3. Step 3: Cross multiply
    85,363.60x = 128,045.40 × 80,525.20
  4. Step 4: Simplify right side
    85,363.60x = 10,310,881,444.08
  5. Step 5: Solve for x
    x = 10,310,881,444.08/85,363.60
  6. Step 6: Final answer
    x = 120,787.80

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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.