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Finding the Fourth Proportional to 640,155.72, 883,424.16 and 353,682.40

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Solution

The fourth proportional to 640,155.72, 883,424.16 and 353,682.40 is: 488,086.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,155.72 : 883,424.16 = 353,682.40 : x
  2. Step 2: Convert to fraction form
    640,155.72/883,424.16 = 353,682.40/x
  3. Step 3: Cross multiply
    640,155.72x = 883,424.16 × 353,682.40
  4. Step 4: Simplify right side
    640,155.72x = 312,451,577,126.78
  5. Step 5: Solve for x
    x = 312,451,577,126.78/640,155.72
  6. Step 6: Final answer
    x = 488,086.83

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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.