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Finding the Fourth Proportional to 85,856.80, 128,420.70 and 77,035.90

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Solution

The fourth proportional to 85,856.80, 128,420.70 and 77,035.90 is: 115,226.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,856.80 : 128,420.70 = 77,035.90 : x
  2. Step 2: Convert to fraction form
    85,856.80/128,420.70 = 77,035.90/x
  3. Step 3: Cross multiply
    85,856.80x = 128,420.70 × 77,035.90
  4. Step 4: Simplify right side
    85,856.80x = 9,893,004,203.13
  5. Step 5: Solve for x
    x = 9,893,004,203.13/85,856.80
  6. Step 6: Final answer
    x = 115,226.80

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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.