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Finding the Fourth Proportional to 342,017.80, 513,026.70 and 128,785.30

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Solution

The fourth proportional to 342,017.80, 513,026.70 and 128,785.30 is: 193,177.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    342,017.80 : 513,026.70 = 128,785.30 : x
  2. Step 2: Convert to fraction form
    342,017.80/513,026.70 = 128,785.30/x
  3. Step 3: Cross multiply
    342,017.80x = 513,026.70 × 128,785.30
  4. Step 4: Simplify right side
    342,017.80x = 66,070,297,467.51
  5. Step 5: Solve for x
    x = 66,070,297,467.51/342,017.80
  6. Step 6: Final answer
    x = 193,177.95

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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.