Home / 431,724.80-647,587.20-423,430.40

Finding the Fourth Proportional to 431,724.80, 647,587.20 and 423,430.40

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Solution

The fourth proportional to 431,724.80, 647,587.20 and 423,430.40 is: 635,145.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,724.80 : 647,587.20 = 423,430.40 : x
  2. Step 2: Convert to fraction form
    431,724.80/647,587.20 = 423,430.40/x
  3. Step 3: Cross multiply
    431,724.80x = 647,587.20 × 423,430.40
  4. Step 4: Simplify right side
    431,724.80x = 274,208,107,130.88
  5. Step 5: Solve for x
    x = 274,208,107,130.88/431,724.80
  6. Step 6: Final answer
    x = 635,145.60

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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.