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Finding the Fourth Proportional to 876.14, 1,209 and 503.09

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Solution

The fourth proportional to 876.14, 1,209 and 503.09 is: 694.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.14 : 1,209 = 503.09 : x
  2. Step 2: Convert to fraction form
    876.14/1,209 = 503.09/x
  3. Step 3: Cross multiply
    876.14x = 1,209 × 503.09
  4. Step 4: Simplify right side
    876.14x = 608,235.81
  5. Step 5: Solve for x
    x = 608,235.81/876.14
  6. Step 6: Final answer
    x = 694.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.