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Finding the Fourth Proportional to 480,744.40, 720,166.20 and 421,646.80

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Solution

The fourth proportional to 480,744.40, 720,166.20 and 421,646.80 is: 631,636.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,744.40 : 720,166.20 = 421,646.80 : x
  2. Step 2: Convert to fraction form
    480,744.40/720,166.20 = 421,646.80/x
  3. Step 3: Cross multiply
    480,744.40x = 720,166.20 × 421,646.80
  4. Step 4: Simplify right side
    480,744.40x = 303,655,773,698.16
  5. Step 5: Solve for x
    x = 303,655,773,698.16/480,744.40
  6. Step 6: Final answer
    x = 631,636.63

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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.