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Finding the Fourth Proportional to 85,145.76, 127,718.64 and 25,981.74

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Solution

The fourth proportional to 85,145.76, 127,718.64 and 25,981.74 is: 38,972.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,145.76 : 127,718.64 = 25,981.74 : x
  2. Step 2: Convert to fraction form
    85,145.76/127,718.64 = 25,981.74/x
  3. Step 3: Cross multiply
    85,145.76x = 127,718.64 × 25,981.74
  4. Step 4: Simplify right side
    85,145.76x = 3,318,352,497.63
  5. Step 5: Solve for x
    x = 3,318,352,497.63/85,145.76
  6. Step 6: Final answer
    x = 38,972.61

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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.