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Finding the Fourth Proportional to 886.16, 1,220.32 and 689.34

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Solution

The fourth proportional to 886.16, 1,220.32 and 689.34 is: 949.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.16 : 1,220.32 = 689.34 : x
  2. Step 2: Convert to fraction form
    886.16/1,220.32 = 689.34/x
  3. Step 3: Cross multiply
    886.16x = 1,220.32 × 689.34
  4. Step 4: Simplify right side
    886.16x = 841,215.39
  5. Step 5: Solve for x
    x = 841,215.39/886.16
  6. Step 6: Final answer
    x = 949.28

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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.