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Finding the Fourth Proportional to 491,637.75, 678,472.78 and 276,785.51

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Solution

The fourth proportional to 491,637.75, 678,472.78 and 276,785.51 is: 381,971.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,637.75 : 678,472.78 = 276,785.51 : x
  2. Step 2: Convert to fraction form
    491,637.75/678,472.78 = 276,785.51/x
  3. Step 3: Cross multiply
    491,637.75x = 678,472.78 × 276,785.51
  4. Step 4: Simplify right side
    491,637.75x = 187,791,431,646.52
  5. Step 5: Solve for x
    x = 187,791,431,646.52/491,637.75
  6. Step 6: Final answer
    x = 381,971.14

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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.