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Finding the Fourth Proportional to 448,086.80, 672,130.20 and 421,821.20

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Solution

The fourth proportional to 448,086.80, 672,130.20 and 421,821.20 is: 632,731.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    448,086.80 : 672,130.20 = 421,821.20 : x
  2. Step 2: Convert to fraction form
    448,086.80/672,130.20 = 421,821.20/x
  3. Step 3: Cross multiply
    448,086.80x = 672,130.20 × 421,821.20
  4. Step 4: Simplify right side
    448,086.80x = 283,518,767,520.24
  5. Step 5: Solve for x
    x = 283,518,767,520.24/448,086.80
  6. Step 6: Final answer
    x = 632,731.80

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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.