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Finding the Fourth Proportional to 425,929.80, 638,894.70 and 319,641.60

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Solution

The fourth proportional to 425,929.80, 638,894.70 and 319,641.60 is: 479,462.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,929.80 : 638,894.70 = 319,641.60 : x
  2. Step 2: Convert to fraction form
    425,929.80/638,894.70 = 319,641.60/x
  3. Step 3: Cross multiply
    425,929.80x = 638,894.70 × 319,641.60
  4. Step 4: Simplify right side
    425,929.80x = 204,217,324,139.52
  5. Step 5: Solve for x
    x = 204,217,324,139.52/425,929.80
  6. Step 6: Final answer
    x = 479,462.40

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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.