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Finding the Fourth Proportional to 947.91, 1,308.39 and 555.09

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Solution

The fourth proportional to 947.91, 1,308.39 and 555.09 is: 766.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.91 : 1,308.39 = 555.09 : x
  2. Step 2: Convert to fraction form
    947.91/1,308.39 = 555.09/x
  3. Step 3: Cross multiply
    947.91x = 1,308.39 × 555.09
  4. Step 4: Simplify right side
    947.91x = 726,274.21
  5. Step 5: Solve for x
    x = 726,274.21/947.91
  6. Step 6: Final answer
    x = 766.18

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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.