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Finding the Fourth Proportional to 170,288.92, 255,089.13 and 85,931.47

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Solution

The fourth proportional to 170,288.92, 255,089.13 and 85,931.47 is: 128,723.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,288.92 : 255,089.13 = 85,931.47 : x
  2. Step 2: Convert to fraction form
    170,288.92/255,089.13 = 85,931.47/x
  3. Step 3: Cross multiply
    170,288.92x = 255,089.13 × 85,931.47
  4. Step 4: Simplify right side
    170,288.92x = 21,920,183,921.92
  5. Step 5: Solve for x
    x = 21,920,183,921.92/170,288.92
  6. Step 6: Final answer
    x = 128,723.49

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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.