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Finding the Fourth Proportional to 85,820.40, 128,730.60 and 57,753.90

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Solution

The fourth proportional to 85,820.40, 128,730.60 and 57,753.90 is: 86,630.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,820.40 : 128,730.60 = 57,753.90 : x
  2. Step 2: Convert to fraction form
    85,820.40/128,730.60 = 57,753.90/x
  3. Step 3: Cross multiply
    85,820.40x = 128,730.60 × 57,753.90
  4. Step 4: Simplify right side
    85,820.40x = 7,434,694,199.34
  5. Step 5: Solve for x
    x = 7,434,694,199.34/85,820.40
  6. Step 6: Final answer
    x = 86,630.85

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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.