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Finding the Fourth Proportional to 85,671.12, 128,515.38 and 29,503.88

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Solution

The fourth proportional to 85,671.12, 128,515.38 and 29,503.88 is: 44,258.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,671.12 : 128,515.38 = 29,503.88 : x
  2. Step 2: Convert to fraction form
    85,671.12/128,515.38 = 29,503.88/x
  3. Step 3: Cross multiply
    85,671.12x = 128,515.38 × 29,503.88
  4. Step 4: Simplify right side
    85,671.12x = 3,791,702,349.67
  5. Step 5: Solve for x
    x = 3,791,702,349.67/85,671.12
  6. Step 6: Final answer
    x = 44,258.82

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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.