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Finding the Fourth Proportional to 881.84, 1,216.20 and 765.20

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Solution

The fourth proportional to 881.84, 1,216.20 and 765.20 is: 1,055.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.84 : 1,216.20 = 765.20 : x
  2. Step 2: Convert to fraction form
    881.84/1,216.20 = 765.20/x
  3. Step 3: Cross multiply
    881.84x = 1,216.20 × 765.20
  4. Step 4: Simplify right side
    881.84x = 930,636.24
  5. Step 5: Solve for x
    x = 930,636.24/881.84
  6. Step 6: Final answer
    x = 1,055.33

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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.