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Finding the Fourth Proportional to 639,987.28, 883,165.50 and 353,501.20

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Solution

The fourth proportional to 639,987.28, 883,165.50 and 353,501.20 is: 487,822.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,987.28 : 883,165.50 = 353,501.20 : x
  2. Step 2: Convert to fraction form
    639,987.28/883,165.50 = 353,501.20/x
  3. Step 3: Cross multiply
    639,987.28x = 883,165.50 × 353,501.20
  4. Step 4: Simplify right side
    639,987.28x = 312,200,064,048.60
  5. Step 5: Solve for x
    x = 312,200,064,048.60/639,987.28
  6. Step 6: Final answer
    x = 487,822.30

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Double scale
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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.