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Finding the Fourth Proportional to 640,475.47, 883,901.99 and 353,989.40

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Solution

The fourth proportional to 640,475.47, 883,901.99 and 353,989.40 is: 488,530.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,475.47 : 883,901.99 = 353,989.40 : x
  2. Step 2: Convert to fraction form
    640,475.47/883,901.99 = 353,989.40/x
  3. Step 3: Cross multiply
    640,475.47x = 883,901.99 × 353,989.40
  4. Step 4: Simplify right side
    640,475.47x = 312,891,933,328.96
  5. Step 5: Solve for x
    x = 312,891,933,328.96/640,475.47
  6. Step 6: Final answer
    x = 488,530.71

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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.