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Finding the Fourth Proportional to 672.76, 927.91 and 643.32

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Solution

The fourth proportional to 672.76, 927.91 and 643.32 is: 887.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.76 : 927.91 = 643.32 : x
  2. Step 2: Convert to fraction form
    672.76/927.91 = 643.32/x
  3. Step 3: Cross multiply
    672.76x = 927.91 × 643.32
  4. Step 4: Simplify right side
    672.76x = 596,943.87
  5. Step 5: Solve for x
    x = 596,943.87/672.76
  6. Step 6: Final answer
    x = 887.30

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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.