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Finding the Fourth Proportional to 640,417.40, 959,589.30 and 403,335.80

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Solution

The fourth proportional to 640,417.40, 959,589.30 and 403,335.80 is: 604,350.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,417.40 : 959,589.30 = 403,335.80 : x
  2. Step 2: Convert to fraction form
    640,417.40/959,589.30 = 403,335.80/x
  3. Step 3: Cross multiply
    640,417.40x = 959,589.30 × 403,335.80
  4. Step 4: Simplify right side
    640,417.40x = 387,036,717,986.94
  5. Step 5: Solve for x
    x = 387,036,717,986.94/640,417.40
  6. Step 6: Final answer
    x = 604,350.72

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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.