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Finding the Fourth Proportional to 640,679.40, 884,143.08 and 354,211.56

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Solution

The fourth proportional to 640,679.40, 884,143.08 and 354,211.56 is: 488,815.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,679.40 : 884,143.08 = 354,211.56 : x
  2. Step 2: Convert to fraction form
    640,679.40/884,143.08 = 354,211.56/x
  3. Step 3: Cross multiply
    640,679.40x = 884,143.08 × 354,211.56
  4. Step 4: Simplify right side
    640,679.40x = 313,173,699,630.01
  5. Step 5: Solve for x
    x = 313,173,699,630.01/640,679.40
  6. Step 6: Final answer
    x = 488,815.00

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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.