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Finding the Fourth Proportional to 1,021.02, 1,530.66 and 874.20

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Solution

The fourth proportional to 1,021.02, 1,530.66 and 874.20 is: 1,310.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.02 : 1,530.66 = 874.20 : x
  2. Step 2: Convert to fraction form
    1,021.02/1,530.66 = 874.20/x
  3. Step 3: Cross multiply
    1,021.02x = 1,530.66 × 874.20
  4. Step 4: Simplify right side
    1,021.02x = 1,338,102.97
  5. Step 5: Solve for x
    x = 1,338,102.97/1,021.02
  6. Step 6: Final answer
    x = 1,310.56

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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.