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Finding the Fourth Proportional to 1,215.63, 1,825.11 and 631.11

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Solution

The fourth proportional to 1,215.63, 1,825.11 and 631.11 is: 947.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.63 : 1,825.11 = 631.11 : x
  2. Step 2: Convert to fraction form
    1,215.63/1,825.11 = 631.11/x
  3. Step 3: Cross multiply
    1,215.63x = 1,825.11 × 631.11
  4. Step 4: Simplify right side
    1,215.63x = 1,151,845.17
  5. Step 5: Solve for x
    x = 1,151,845.17/1,215.63
  6. Step 6: Final answer
    x = 947.53

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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.