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Finding the Fourth Proportional to 425,904.60, 638,856.90 and 238,891.80

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Solution

The fourth proportional to 425,904.60, 638,856.90 and 238,891.80 is: 358,337.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,904.60 : 638,856.90 = 238,891.80 : x
  2. Step 2: Convert to fraction form
    425,904.60/638,856.90 = 238,891.80/x
  3. Step 3: Cross multiply
    425,904.60x = 638,856.90 × 238,891.80
  4. Step 4: Simplify right side
    425,904.60x = 152,617,674,783.42
  5. Step 5: Solve for x
    x = 152,617,674,783.42/425,904.60
  6. Step 6: Final answer
    x = 358,337.70

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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.