Home / 431,664.20-647,496.30-428,899.40

Finding the Fourth Proportional to 431,664.20, 647,496.30 and 428,899.40

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Solution

The fourth proportional to 431,664.20, 647,496.30 and 428,899.40 is: 643,349.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,664.20 : 647,496.30 = 428,899.40 : x
  2. Step 2: Convert to fraction form
    431,664.20/647,496.30 = 428,899.40/x
  3. Step 3: Cross multiply
    431,664.20x = 647,496.30 × 428,899.40
  4. Step 4: Simplify right side
    431,664.20x = 277,710,774,572.22
  5. Step 5: Solve for x
    x = 277,710,774,572.22/431,664.20
  6. Step 6: Final answer
    x = 643,349.10

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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.