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Finding the Fourth Proportional to 480,739.40, 720,158.70 and 421,641.80

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Solution

The fourth proportional to 480,739.40, 720,158.70 and 421,641.80 is: 631,629.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,739.40 : 720,158.70 = 421,641.80 : x
  2. Step 2: Convert to fraction form
    480,739.40/720,158.70 = 421,641.80/x
  3. Step 3: Cross multiply
    480,739.40x = 720,158.70 × 421,641.80
  4. Step 4: Simplify right side
    480,739.40x = 303,649,010,553.66
  5. Step 5: Solve for x
    x = 303,649,010,553.66/480,739.40
  6. Step 6: Final answer
    x = 631,629.13

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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.