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Finding the Fourth Proportional to 947.97, 1,308.56 and 555.12

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Solution

The fourth proportional to 947.97, 1,308.56 and 555.12 is: 766.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.97 : 1,308.56 = 555.12 : x
  2. Step 2: Convert to fraction form
    947.97/1,308.56 = 555.12/x
  3. Step 3: Cross multiply
    947.97x = 1,308.56 × 555.12
  4. Step 4: Simplify right side
    947.97x = 726,405.05
  5. Step 5: Solve for x
    x = 726,405.05/947.97
  6. Step 6: Final answer
    x = 766.27

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Double scale
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1.5x scale

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.