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Finding the Fourth Proportional to 1,020.70, 1,530.15 and 371.31

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Solution

The fourth proportional to 1,020.70, 1,530.15 and 371.31 is: 556.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.70 : 1,530.15 = 371.31 : x
  2. Step 2: Convert to fraction form
    1,020.70/1,530.15 = 371.31/x
  3. Step 3: Cross multiply
    1,020.70x = 1,530.15 × 371.31
  4. Step 4: Simplify right side
    1,020.70x = 568,160.00
  5. Step 5: Solve for x
    x = 568,160.00/1,020.70
  6. Step 6: Final answer
    x = 556.64

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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.