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Finding the Fourth Proportional to 640,687.25, 884,166.84 and 354,225.76

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Solution

The fourth proportional to 640,687.25, 884,166.84 and 354,225.76 is: 488,841.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,687.25 : 884,166.84 = 354,225.76 : x
  2. Step 2: Convert to fraction form
    640,687.25/884,166.84 = 354,225.76/x
  3. Step 3: Cross multiply
    640,687.25x = 884,166.84 × 354,225.76
  4. Step 4: Simplify right side
    640,687.25x = 313,194,668,655.38
  5. Step 5: Solve for x
    x = 313,194,668,655.38/640,687.25
  6. Step 6: Final answer
    x = 488,841.74

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Double scale
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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.