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Finding the Fourth Proportional to 976.25, 1,347.33 and 645.37

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Solution

The fourth proportional to 976.25, 1,347.33 and 645.37 is: 890.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.25 : 1,347.33 = 645.37 : x
  2. Step 2: Convert to fraction form
    976.25/1,347.33 = 645.37/x
  3. Step 3: Cross multiply
    976.25x = 1,347.33 × 645.37
  4. Step 4: Simplify right side
    976.25x = 869,525.41
  5. Step 5: Solve for x
    x = 869,525.41/976.25
  6. Step 6: Final answer
    x = 890.68

Related Problems

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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.