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Finding the Fourth Proportional to 485,865.80, 728,798.70 and 426,816.80

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Solution

The fourth proportional to 485,865.80, 728,798.70 and 426,816.80 is: 640,225.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,865.80 : 728,798.70 = 426,816.80 : x
  2. Step 2: Convert to fraction form
    485,865.80/728,798.70 = 426,816.80/x
  3. Step 3: Cross multiply
    485,865.80x = 728,798.70 × 426,816.80
  4. Step 4: Simplify right side
    485,865.80x = 311,063,528,978.16
  5. Step 5: Solve for x
    x = 311,063,528,978.16/485,865.80
  6. Step 6: Final answer
    x = 640,225.20

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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.