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Finding the Fourth Proportional to 841.40, 1,161.24 and 644.84

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Solution

The fourth proportional to 841.40, 1,161.24 and 644.84 is: 889.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.40 : 1,161.24 = 644.84 : x
  2. Step 2: Convert to fraction form
    841.40/1,161.24 = 644.84/x
  3. Step 3: Cross multiply
    841.40x = 1,161.24 × 644.84
  4. Step 4: Simplify right side
    841.40x = 748,814.00
  5. Step 5: Solve for x
    x = 748,814.00/841.40
  6. Step 6: Final answer
    x = 889.96

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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.