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Finding the Fourth Proportional to 640,278.65, 960,407.01 and 191,000.81

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Solution

The fourth proportional to 640,278.65, 960,407.01 and 191,000.81 is: 286,497.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,278.65 : 960,407.01 = 191,000.81 : x
  2. Step 2: Convert to fraction form
    640,278.65/960,407.01 = 191,000.81/x
  3. Step 3: Cross multiply
    640,278.65x = 960,407.01 × 191,000.81
  4. Step 4: Simplify right side
    640,278.65x = 183,438,512,037.64
  5. Step 5: Solve for x
    x = 183,438,512,037.64/640,278.65
  6. Step 6: Final answer
    x = 286,497.94

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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.