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Finding the Fourth Proportional to 913.48, 1,260.72 and 665.64

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Solution

The fourth proportional to 913.48, 1,260.72 and 665.64 is: 918.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.48 : 1,260.72 = 665.64 : x
  2. Step 2: Convert to fraction form
    913.48/1,260.72 = 665.64/x
  3. Step 3: Cross multiply
    913.48x = 1,260.72 × 665.64
  4. Step 4: Simplify right side
    913.48x = 839,185.66
  5. Step 5: Solve for x
    x = 839,185.66/913.48
  6. Step 6: Final answer
    x = 918.67

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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.