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Finding the Fourth Proportional to 425,514.30, 638,271.45 and 215,124.90

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Solution

The fourth proportional to 425,514.30, 638,271.45 and 215,124.90 is: 322,687.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,514.30 : 638,271.45 = 215,124.90 : x
  2. Step 2: Convert to fraction form
    425,514.30/638,271.45 = 215,124.90/x
  3. Step 3: Cross multiply
    425,514.30x = 638,271.45 × 215,124.90
  4. Step 4: Simplify right side
    425,514.30x = 137,308,081,854.11
  5. Step 5: Solve for x
    x = 137,308,081,854.11/425,514.30
  6. Step 6: Final answer
    x = 322,687.35

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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.