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Finding the Fourth Proportional to 886.68, 1,223.74 and 665.24

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Solution

The fourth proportional to 886.68, 1,223.74 and 665.24 is: 918.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.68 : 1,223.74 = 665.24 : x
  2. Step 2: Convert to fraction form
    886.68/1,223.74 = 665.24/x
  3. Step 3: Cross multiply
    886.68x = 1,223.74 × 665.24
  4. Step 4: Simplify right side
    886.68x = 814,080.80
  5. Step 5: Solve for x
    x = 814,080.80/886.68
  6. Step 6: Final answer
    x = 918.12

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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.