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Finding the Fourth Proportional to 640,643.50, 884,011.28 and 354,124.63

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Solution

The fourth proportional to 640,643.50, 884,011.28 and 354,124.63 is: 488,649.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,643.50 : 884,011.28 = 354,124.63 : x
  2. Step 2: Convert to fraction form
    640,643.50/884,011.28 = 354,124.63/x
  3. Step 3: Cross multiply
    640,643.50x = 884,011.28 × 354,124.63
  4. Step 4: Simplify right side
    640,643.50x = 313,050,167,445.83
  5. Step 5: Solve for x
    x = 313,050,167,445.83/640,643.50
  6. Step 6: Final answer
    x = 488,649.56

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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.