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Finding the Fourth Proportional to 1,209.25, 1,813.90 and 525.25

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Solution

The fourth proportional to 1,209.25, 1,813.90 and 525.25 is: 787.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.25 : 1,813.90 = 525.25 : x
  2. Step 2: Convert to fraction form
    1,209.25/1,813.90 = 525.25/x
  3. Step 3: Cross multiply
    1,209.25x = 1,813.90 × 525.25
  4. Step 4: Simplify right side
    1,209.25x = 952,748.35
  5. Step 5: Solve for x
    x = 952,748.35/1,209.25
  6. Step 6: Final answer
    x = 787.88

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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.