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Finding the Fourth Proportional to 85,752.18, 128,672.13 and 40,824.32

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Solution

The fourth proportional to 85,752.18, 128,672.13 and 40,824.32 is: 61,257.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,752.18 : 128,672.13 = 40,824.32 : x
  2. Step 2: Convert to fraction form
    85,752.18/128,672.13 = 40,824.32/x
  3. Step 3: Cross multiply
    85,752.18x = 128,672.13 × 40,824.32
  4. Step 4: Simplify right side
    85,752.18x = 5,252,951,566.84
  5. Step 5: Solve for x
    x = 5,252,951,566.84/85,752.18
  6. Step 6: Final answer
    x = 61,257.35

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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.