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Finding the Fourth Proportional to 640,687.40, 884,133.06 and 354,200.20

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Solution

The fourth proportional to 640,687.40, 884,133.06 and 354,200.20 is: 488,787.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,687.40 : 884,133.06 = 354,200.20 : x
  2. Step 2: Convert to fraction form
    640,687.40/884,133.06 = 354,200.20/x
  3. Step 3: Cross multiply
    640,687.40x = 884,133.06 × 354,200.20
  4. Step 4: Simplify right side
    640,687.40x = 313,160,106,678.61
  5. Step 5: Solve for x
    x = 313,160,106,678.61/640,687.40
  6. Step 6: Final answer
    x = 488,787.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.