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Finding the Fourth Proportional to 688.62, 947.51 and 672.22

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Solution

The fourth proportional to 688.62, 947.51 and 672.22 is: 924.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.62 : 947.51 = 672.22 : x
  2. Step 2: Convert to fraction form
    688.62/947.51 = 672.22/x
  3. Step 3: Cross multiply
    688.62x = 947.51 × 672.22
  4. Step 4: Simplify right side
    688.62x = 636,933.97
  5. Step 5: Solve for x
    x = 636,933.97/688.62
  6. Step 6: Final answer
    x = 924.95

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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.