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Finding the Fourth Proportional to 1,020.71, 1,530.18 and 371

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Solution

The fourth proportional to 1,020.71, 1,530.18 and 371 is: 556.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.71 : 1,530.18 = 371 : x
  2. Step 2: Convert to fraction form
    1,020.71/1,530.18 = 371/x
  3. Step 3: Cross multiply
    1,020.71x = 1,530.18 × 371
  4. Step 4: Simplify right side
    1,020.71x = 567,696.78
  5. Step 5: Solve for x
    x = 567,696.78/1,020.71
  6. Step 6: Final answer
    x = 556.18

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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.