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Finding the Fourth Proportional to 947.74, 1,308.38 and 668.82

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Solution

The fourth proportional to 947.74, 1,308.38 and 668.82 is: 923.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.74 : 1,308.38 = 668.82 : x
  2. Step 2: Convert to fraction form
    947.74/1,308.38 = 668.82/x
  3. Step 3: Cross multiply
    947.74x = 1,308.38 × 668.82
  4. Step 4: Simplify right side
    947.74x = 875,070.71
  5. Step 5: Solve for x
    x = 875,070.71/947.74
  6. Step 6: Final answer
    x = 923.32

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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.