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Finding the Fourth Proportional to 665,710.40, 998,695.20 and 286,630.40

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Solution

The fourth proportional to 665,710.40, 998,695.20 and 286,630.40 is: 430,001.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,710.40 : 998,695.20 = 286,630.40 : x
  2. Step 2: Convert to fraction form
    665,710.40/998,695.20 = 286,630.40/x
  3. Step 3: Cross multiply
    665,710.40x = 998,695.20 × 286,630.40
  4. Step 4: Simplify right side
    665,710.40x = 286,256,404,654.08
  5. Step 5: Solve for x
    x = 286,256,404,654.08/665,710.40
  6. Step 6: Final answer
    x = 430,001.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.