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Finding the Fourth Proportional to 480,740.40, 720,160.20 and 421,642.80

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Solution

The fourth proportional to 480,740.40, 720,160.20 and 421,642.80 is: 631,630.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,740.40 : 720,160.20 = 421,642.80 : x
  2. Step 2: Convert to fraction form
    480,740.40/720,160.20 = 421,642.80/x
  3. Step 3: Cross multiply
    480,740.40x = 720,160.20 × 421,642.80
  4. Step 4: Simplify right side
    480,740.40x = 303,650,363,176.56
  5. Step 5: Solve for x
    x = 303,650,363,176.56/480,740.40
  6. Step 6: Final answer
    x = 631,630.63

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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.