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Finding the Fourth Proportional to 291,078.80, 435,743.40 and 172,689.20

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Solution

The fourth proportional to 291,078.80, 435,743.40 and 172,689.20 is: 258,514.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,078.80 : 435,743.40 = 172,689.20 : x
  2. Step 2: Convert to fraction form
    291,078.80/435,743.40 = 172,689.20/x
  3. Step 3: Cross multiply
    291,078.80x = 435,743.40 × 172,689.20
  4. Step 4: Simplify right side
    291,078.80x = 75,248,179,151.28
  5. Step 5: Solve for x
    x = 75,248,179,151.28/291,078.80
  6. Step 6: Final answer
    x = 258,514.80

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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.