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Finding the Fourth Proportional to 1,019.28, 1,526.40 and 628.32

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Solution

The fourth proportional to 1,019.28, 1,526.40 and 628.32 is: 940.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.28 : 1,526.40 = 628.32 : x
  2. Step 2: Convert to fraction form
    1,019.28/1,526.40 = 628.32/x
  3. Step 3: Cross multiply
    1,019.28x = 1,526.40 × 628.32
  4. Step 4: Simplify right side
    1,019.28x = 959,067.65
  5. Step 5: Solve for x
    x = 959,067.65/1,019.28
  6. Step 6: Final answer
    x = 940.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.