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Finding the Fourth Proportional to 85,955.39, 129,078.49 and 56,020.49

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Solution

The fourth proportional to 85,955.39, 129,078.49 and 56,020.49 is: 84,125.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,955.39 : 129,078.49 = 56,020.49 : x
  2. Step 2: Convert to fraction form
    85,955.39/129,078.49 = 56,020.49/x
  3. Step 3: Cross multiply
    85,955.39x = 129,078.49 × 56,020.49
  4. Step 4: Simplify right side
    85,955.39x = 7,231,040,258.26
  5. Step 5: Solve for x
    x = 7,231,040,258.26/85,955.39
  6. Step 6: Final answer
    x = 84,125.50

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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.