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Finding the Fourth Proportional to 885.78, 1,222.81 and 554.69

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Solution

The fourth proportional to 885.78, 1,222.81 and 554.69 is: 765.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.78 : 1,222.81 = 554.69 : x
  2. Step 2: Convert to fraction form
    885.78/1,222.81 = 554.69/x
  3. Step 3: Cross multiply
    885.78x = 1,222.81 × 554.69
  4. Step 4: Simplify right side
    885.78x = 678,282.15
  5. Step 5: Solve for x
    x = 678,282.15/885.78
  6. Step 6: Final answer
    x = 765.75

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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.