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Finding the Fourth Proportional to 425,719.80, 638,579.70 and 386,353.80

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Solution

The fourth proportional to 425,719.80, 638,579.70 and 386,353.80 is: 579,530.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,719.80 : 638,579.70 = 386,353.80 : x
  2. Step 2: Convert to fraction form
    425,719.80/638,579.70 = 386,353.80/x
  3. Step 3: Cross multiply
    425,719.80x = 638,579.70 × 386,353.80
  4. Step 4: Simplify right side
    425,719.80x = 246,717,693,697.86
  5. Step 5: Solve for x
    x = 246,717,693,697.86/425,719.80
  6. Step 6: Final answer
    x = 579,530.70

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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.