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Finding the Fourth Proportional to 491,642.55, 678,479.40 and 276,790.30

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Solution

The fourth proportional to 491,642.55, 678,479.40 and 276,790.30 is: 381,977.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,642.55 : 678,479.40 = 276,790.30 : x
  2. Step 2: Convert to fraction form
    491,642.55/678,479.40 = 276,790.30/x
  3. Step 3: Cross multiply
    491,642.55x = 678,479.40 × 276,790.30
  4. Step 4: Simplify right side
    491,642.55x = 187,796,516,669.82
  5. Step 5: Solve for x
    x = 187,796,516,669.82/491,642.55
  6. Step 6: Final answer
    x = 381,977.75

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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.