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Finding the Fourth Proportional to 1,209, 1,812.48 and 515.64

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Solution

The fourth proportional to 1,209, 1,812.48 and 515.64 is: 773.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209 : 1,812.48 = 515.64 : x
  2. Step 2: Convert to fraction form
    1,209/1,812.48 = 515.64/x
  3. Step 3: Cross multiply
    1,209x = 1,812.48 × 515.64
  4. Step 4: Simplify right side
    1,209x = 934,587.19
  5. Step 5: Solve for x
    x = 934,587.19/1,209
  6. Step 6: Final answer
    x = 773.02

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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.