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Finding the Fourth Proportional to 640,643.25, 884,010.90 and 354,124.38

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Solution

The fourth proportional to 640,643.25, 884,010.90 and 354,124.38 is: 488,649.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,643.25 : 884,010.90 = 354,124.38 : x
  2. Step 2: Convert to fraction form
    640,643.25/884,010.90 = 354,124.38/x
  3. Step 3: Cross multiply
    640,643.25x = 884,010.90 × 354,124.38
  4. Step 4: Simplify right side
    640,643.25x = 313,049,811,875.74
  5. Step 5: Solve for x
    x = 313,049,811,875.74/640,643.25
  6. Step 6: Final answer
    x = 488,649.20

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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.