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Finding the Fourth Proportional to 906.75, 1,251.32 and 645.23

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Solution

The fourth proportional to 906.75, 1,251.32 and 645.23 is: 890.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.75 : 1,251.32 = 645.23 : x
  2. Step 2: Convert to fraction form
    906.75/1,251.32 = 645.23/x
  3. Step 3: Cross multiply
    906.75x = 1,251.32 × 645.23
  4. Step 4: Simplify right side
    906.75x = 807,389.11
  5. Step 5: Solve for x
    x = 807,389.11/906.75
  6. Step 6: Final answer
    x = 890.42

Related Problems

Find fourth proportional to 453.38, 625.66 and 322.62
Half scale
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Double scale
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Similar ratio
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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.