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Finding the Fourth Proportional to 906.40, 1,250.88 and 513.40

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Solution

The fourth proportional to 906.40, 1,250.88 and 513.40 is: 708.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.40 : 1,250.88 = 513.40 : x
  2. Step 2: Convert to fraction form
    906.40/1,250.88 = 513.40/x
  3. Step 3: Cross multiply
    906.40x = 1,250.88 × 513.40
  4. Step 4: Simplify right side
    906.40x = 642,201.79
  5. Step 5: Solve for x
    x = 642,201.79/906.40
  6. Step 6: Final answer
    x = 708.52

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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.