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Finding the Fourth Proportional to 1,019.55, 1,529.31 and 289.11

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Solution

The fourth proportional to 1,019.55, 1,529.31 and 289.11 is: 433.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.55 : 1,529.31 = 289.11 : x
  2. Step 2: Convert to fraction form
    1,019.55/1,529.31 = 289.11/x
  3. Step 3: Cross multiply
    1,019.55x = 1,529.31 × 289.11
  4. Step 4: Simplify right side
    1,019.55x = 442,138.81
  5. Step 5: Solve for x
    x = 442,138.81/1,019.55
  6. Step 6: Final answer
    x = 433.66

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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.