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Finding the Fourth Proportional to 1,020.68, 1,530.98 and 404.20

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Solution

The fourth proportional to 1,020.68, 1,530.98 and 404.20 is: 606.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.68 : 1,530.98 = 404.20 : x
  2. Step 2: Convert to fraction form
    1,020.68/1,530.98 = 404.20/x
  3. Step 3: Cross multiply
    1,020.68x = 1,530.98 × 404.20
  4. Step 4: Simplify right side
    1,020.68x = 618,822.12
  5. Step 5: Solve for x
    x = 618,822.12/1,020.68
  6. Step 6: Final answer
    x = 606.28

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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.