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Finding the Fourth Proportional to 561,676.80, 842,515.20 and 421,708.80

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Solution

The fourth proportional to 561,676.80, 842,515.20 and 421,708.80 is: 632,563.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    561,676.80 : 842,515.20 = 421,708.80 : x
  2. Step 2: Convert to fraction form
    561,676.80/842,515.20 = 421,708.80/x
  3. Step 3: Cross multiply
    561,676.80x = 842,515.20 × 421,708.80
  4. Step 4: Simplify right side
    561,676.80x = 355,296,073,973.76
  5. Step 5: Solve for x
    x = 355,296,073,973.76/561,676.80
  6. Step 6: Final answer
    x = 632,563.20

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Similar ratio
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1.5x scale

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.