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Finding the Fourth Proportional to 640,006.40, 960,009.60 and 402,579.20

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Solution

The fourth proportional to 640,006.40, 960,009.60 and 402,579.20 is: 603,868.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,006.40 : 960,009.60 = 402,579.20 : x
  2. Step 2: Convert to fraction form
    640,006.40/960,009.60 = 402,579.20/x
  3. Step 3: Cross multiply
    640,006.40x = 960,009.60 × 402,579.20
  4. Step 4: Simplify right side
    640,006.40x = 386,479,896,760.32
  5. Step 5: Solve for x
    x = 386,479,896,760.32/640,006.40
  6. Step 6: Final answer
    x = 603,868.80

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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.