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Finding the Fourth Proportional to 1,225.90, 1,691.78 and 666.41

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Solution

The fourth proportional to 1,225.90, 1,691.78 and 666.41 is: 919.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.90 : 1,691.78 = 666.41 : x
  2. Step 2: Convert to fraction form
    1,225.90/1,691.78 = 666.41/x
  3. Step 3: Cross multiply
    1,225.90x = 1,691.78 × 666.41
  4. Step 4: Simplify right side
    1,225.90x = 1,127,419.11
  5. Step 5: Solve for x
    x = 1,127,419.11/1,225.90
  6. Step 6: Final answer
    x = 919.67

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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.