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Finding the Fourth Proportional to 933.78, 1,288.04 and 775.49

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Solution

The fourth proportional to 933.78, 1,288.04 and 775.49 is: 1,069.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.78 : 1,288.04 = 775.49 : x
  2. Step 2: Convert to fraction form
    933.78/1,288.04 = 775.49/x
  3. Step 3: Cross multiply
    933.78x = 1,288.04 × 775.49
  4. Step 4: Simplify right side
    933.78x = 998,851.82
  5. Step 5: Solve for x
    x = 998,851.82/933.78
  6. Step 6: Final answer
    x = 1,069.69

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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.