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Finding the Fourth Proportional to 425,613.80, 638,420.70 and 215,661.80

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Solution

The fourth proportional to 425,613.80, 638,420.70 and 215,661.80 is: 323,492.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,613.80 : 638,420.70 = 215,661.80 : x
  2. Step 2: Convert to fraction form
    425,613.80/638,420.70 = 215,661.80/x
  3. Step 3: Cross multiply
    425,613.80x = 638,420.70 × 215,661.80
  4. Step 4: Simplify right side
    425,613.80x = 137,682,957,319.26
  5. Step 5: Solve for x
    x = 137,682,957,319.26/425,613.80
  6. Step 6: Final answer
    x = 323,492.70

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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.