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Finding the Fourth Proportional to 342,216.48, 513,397.02 and 128,979.88

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Solution

The fourth proportional to 342,216.48, 513,397.02 and 128,979.88 is: 193,497.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    342,216.48 : 513,397.02 = 128,979.88 : x
  2. Step 2: Convert to fraction form
    342,216.48/513,397.02 = 128,979.88/x
  3. Step 3: Cross multiply
    342,216.48x = 513,397.02 × 128,979.88
  4. Step 4: Simplify right side
    342,216.48x = 66,217,886,031.96
  5. Step 5: Solve for x
    x = 66,217,886,031.96/342,216.48
  6. Step 6: Final answer
    x = 193,497.07

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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.