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Finding the Fourth Proportional to 499,085.20, 748,627.80 and 420,353.20

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Solution

The fourth proportional to 499,085.20, 748,627.80 and 420,353.20 is: 630,529.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,085.20 : 748,627.80 = 420,353.20 : x
  2. Step 2: Convert to fraction form
    499,085.20/748,627.80 = 420,353.20/x
  3. Step 3: Cross multiply
    499,085.20x = 748,627.80 × 420,353.20
  4. Step 4: Simplify right side
    499,085.20x = 314,688,091,338.96
  5. Step 5: Solve for x
    x = 314,688,091,338.96/499,085.20
  6. Step 6: Final answer
    x = 630,529.80

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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.