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Finding the Fourth Proportional to 1,589.40, 2,383.92 and 435

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Solution

The fourth proportional to 1,589.40, 2,383.92 and 435 is: 652.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,589.40 : 2,383.92 = 435 : x
  2. Step 2: Convert to fraction form
    1,589.40/2,383.92 = 435/x
  3. Step 3: Cross multiply
    1,589.40x = 2,383.92 × 435
  4. Step 4: Simplify right side
    1,589.40x = 1,037,005.20
  5. Step 5: Solve for x
    x = 1,037,005.20/1,589.40
  6. Step 6: Final answer
    x = 652.45

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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.