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Finding the Fourth Proportional to 640,835.40, 960,216.30 and 403,753.80

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Solution

The fourth proportional to 640,835.40, 960,216.30 and 403,753.80 is: 604,977.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,835.40 : 960,216.30 = 403,753.80 : x
  2. Step 2: Convert to fraction form
    640,835.40/960,216.30 = 403,753.80/x
  3. Step 3: Cross multiply
    640,835.40x = 960,216.30 × 403,753.80
  4. Step 4: Simplify right side
    640,835.40x = 387,690,979,946.94
  5. Step 5: Solve for x
    x = 387,690,979,946.94/640,835.40
  6. Step 6: Final answer
    x = 604,977.47

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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.