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Finding the Fourth Proportional to 85,921.75, 128,710.17 and 43,800.13

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Solution

The fourth proportional to 85,921.75, 128,710.17 and 43,800.13 is: 65,612.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,921.75 : 128,710.17 = 43,800.13 : x
  2. Step 2: Convert to fraction form
    85,921.75/128,710.17 = 43,800.13/x
  3. Step 3: Cross multiply
    85,921.75x = 128,710.17 × 43,800.13
  4. Step 4: Simplify right side
    85,921.75x = 5,637,522,178.32
  5. Step 5: Solve for x
    x = 5,637,522,178.32/85,921.75
  6. Step 6: Final answer
    x = 65,612.28

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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.