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Finding the Fourth Proportional to 1,020.41, 1,530.62 and 289.90

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Solution

The fourth proportional to 1,020.41, 1,530.62 and 289.90 is: 434.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.41 : 1,530.62 = 289.90 : x
  2. Step 2: Convert to fraction form
    1,020.41/1,530.62 = 289.90/x
  3. Step 3: Cross multiply
    1,020.41x = 1,530.62 × 289.90
  4. Step 4: Simplify right side
    1,020.41x = 443,720.49
  5. Step 5: Solve for x
    x = 443,720.49/1,020.41
  6. Step 6: Final answer
    x = 434.84

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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.