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Finding the Fourth Proportional to 86,478.48, 129,717.72 and 66,785.76

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Solution

The fourth proportional to 86,478.48, 129,717.72 and 66,785.76 is: 100,178.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,478.48 : 129,717.72 = 66,785.76 : x
  2. Step 2: Convert to fraction form
    86,478.48/129,717.72 = 66,785.76/x
  3. Step 3: Cross multiply
    86,478.48x = 129,717.72 × 66,785.76
  4. Step 4: Simplify right side
    86,478.48x = 8,663,296,515.67
  5. Step 5: Solve for x
    x = 8,663,296,515.67/86,478.48
  6. Step 6: Final answer
    x = 100,178.64

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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.