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Finding the Fourth Proportional to 903.88, 1,246.95 and 638.71

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Solution

The fourth proportional to 903.88, 1,246.95 and 638.71 is: 881.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.88 : 1,246.95 = 638.71 : x
  2. Step 2: Convert to fraction form
    903.88/1,246.95 = 638.71/x
  3. Step 3: Cross multiply
    903.88x = 1,246.95 × 638.71
  4. Step 4: Simplify right side
    903.88x = 796,439.43
  5. Step 5: Solve for x
    x = 796,439.43/903.88
  6. Step 6: Final answer
    x = 881.13

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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.