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Finding the Fourth Proportional to 976.60, 1,347.48 and 645.56

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Solution

The fourth proportional to 976.60, 1,347.48 and 645.56 is: 890.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.60 : 1,347.48 = 645.56 : x
  2. Step 2: Convert to fraction form
    976.60/1,347.48 = 645.56/x
  3. Step 3: Cross multiply
    976.60x = 1,347.48 × 645.56
  4. Step 4: Simplify right side
    976.60x = 869,879.19
  5. Step 5: Solve for x
    x = 869,879.19/976.60
  6. Step 6: Final answer
    x = 890.72

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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.