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Finding the Fourth Proportional to 640,154.72, 883,422.78 and 353,681.40

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Solution

The fourth proportional to 640,154.72, 883,422.78 and 353,681.40 is: 488,085.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,154.72 : 883,422.78 = 353,681.40 : x
  2. Step 2: Convert to fraction form
    640,154.72/883,422.78 = 353,681.40/x
  3. Step 3: Cross multiply
    640,154.72x = 883,422.78 × 353,681.40
  4. Step 4: Simplify right side
    640,154.72x = 312,450,205,622.29
  5. Step 5: Solve for x
    x = 312,450,205,622.29/640,154.72
  6. Step 6: Final answer
    x = 488,085.45

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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.