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Finding the Fourth Proportional to 1,289.88, 1,935 and 424.08

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Solution

The fourth proportional to 1,289.88, 1,935 and 424.08 is: 636.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.88 : 1,935 = 424.08 : x
  2. Step 2: Convert to fraction form
    1,289.88/1,935 = 424.08/x
  3. Step 3: Cross multiply
    1,289.88x = 1,935 × 424.08
  4. Step 4: Simplify right side
    1,289.88x = 820,594.80
  5. Step 5: Solve for x
    x = 820,594.80/1,289.88
  6. Step 6: Final answer
    x = 636.18

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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.