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Finding the Fourth Proportional to 85,722.64, 128,062.61 and 55,490.56

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Solution

The fourth proportional to 85,722.64, 128,062.61 and 55,490.56 is: 82,898.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,722.64 : 128,062.61 = 55,490.56 : x
  2. Step 2: Convert to fraction form
    85,722.64/128,062.61 = 55,490.56/x
  3. Step 3: Cross multiply
    85,722.64x = 128,062.61 × 55,490.56
  4. Step 4: Simplify right side
    85,722.64x = 7,106,265,943.96
  5. Step 5: Solve for x
    x = 7,106,265,943.96/85,722.64
  6. Step 6: Final answer
    x = 82,898.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.