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Finding the Fourth Proportional to 976.81, 1,347.73 and 645.13

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Solution

The fourth proportional to 976.81, 1,347.73 and 645.13 is: 890.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.81 : 1,347.73 = 645.13 : x
  2. Step 2: Convert to fraction form
    976.81/1,347.73 = 645.13/x
  3. Step 3: Cross multiply
    976.81x = 1,347.73 × 645.13
  4. Step 4: Simplify right side
    976.81x = 869,457.83
  5. Step 5: Solve for x
    x = 869,457.83/976.81
  6. Step 6: Final answer
    x = 890.10

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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.