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Finding the Fourth Proportional to 906.77, 1,251.37 and 513.78

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Solution

The fourth proportional to 906.77, 1,251.37 and 513.78 is: 709.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.77 : 1,251.37 = 513.78 : x
  2. Step 2: Convert to fraction form
    906.77/1,251.37 = 513.78/x
  3. Step 3: Cross multiply
    906.77x = 1,251.37 × 513.78
  4. Step 4: Simplify right side
    906.77x = 642,926.31
  5. Step 5: Solve for x
    x = 642,926.31/906.77
  6. Step 6: Final answer
    x = 709.03

Related Problems

Find fourth proportional to 453.38, 625.68 and 256.89
Half scale
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Double scale
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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.