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Finding the Fourth Proportional to 657,609.86, 907,243.38 and 381,920.78

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Solution

The fourth proportional to 657,609.86, 907,243.38 and 381,920.78 is: 526,900.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,609.86 : 907,243.38 = 381,920.78 : x
  2. Step 2: Convert to fraction form
    657,609.86/907,243.38 = 381,920.78/x
  3. Step 3: Cross multiply
    657,609.86x = 907,243.38 × 381,920.78
  4. Step 4: Simplify right side
    657,609.86x = 346,495,094,803.22
  5. Step 5: Solve for x
    x = 346,495,094,803.22/657,609.86
  6. Step 6: Final answer
    x = 526,900.70

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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.