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Finding the Fourth Proportional to 485,748.80, 728,623.20 and 426,699.80

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Solution

The fourth proportional to 485,748.80, 728,623.20 and 426,699.80 is: 640,049.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,748.80 : 728,623.20 = 426,699.80 : x
  2. Step 2: Convert to fraction form
    485,748.80/728,623.20 = 426,699.80/x
  3. Step 3: Cross multiply
    485,748.80x = 728,623.20 × 426,699.80
  4. Step 4: Simplify right side
    485,748.80x = 310,903,373,715.36
  5. Step 5: Solve for x
    x = 310,903,373,715.36/485,748.80
  6. Step 6: Final answer
    x = 640,049.70

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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.