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Finding the Fourth Proportional to 425,733.60, 638,600.40 and 391,327.20

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Solution

The fourth proportional to 425,733.60, 638,600.40 and 391,327.20 is: 586,990.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,733.60 : 638,600.40 = 391,327.20 : x
  2. Step 2: Convert to fraction form
    425,733.60/638,600.40 = 391,327.20/x
  3. Step 3: Cross multiply
    425,733.60x = 638,600.40 × 391,327.20
  4. Step 4: Simplify right side
    425,733.60x = 249,901,706,450.88
  5. Step 5: Solve for x
    x = 249,901,706,450.88/425,733.60
  6. Step 6: Final answer
    x = 586,990.80

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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.