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Finding the Fourth Proportional to 1,019.40, 1,528.80 and 289

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Solution

The fourth proportional to 1,019.40, 1,528.80 and 289 is: 433.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.40 : 1,528.80 = 289 : x
  2. Step 2: Convert to fraction form
    1,019.40/1,528.80 = 289/x
  3. Step 3: Cross multiply
    1,019.40x = 1,528.80 × 289
  4. Step 4: Simplify right side
    1,019.40x = 441,823.20
  5. Step 5: Solve for x
    x = 441,823.20/1,019.40
  6. Step 6: Final answer
    x = 433.41

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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.