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Finding the Fourth Proportional to 640,421.40, 959,595.30 and 403,339.80

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Solution

The fourth proportional to 640,421.40, 959,595.30 and 403,339.80 is: 604,356.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,421.40 : 959,595.30 = 403,339.80 : x
  2. Step 2: Convert to fraction form
    640,421.40/959,595.30 = 403,339.80/x
  3. Step 3: Cross multiply
    640,421.40x = 959,595.30 × 403,339.80
  4. Step 4: Simplify right side
    640,421.40x = 387,042,976,382.94
  5. Step 5: Solve for x
    x = 387,042,976,382.94/640,421.40
  6. Step 6: Final answer
    x = 604,356.72

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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.