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Finding the Fourth Proportional to 922.39, 1,272.44 and 643.07

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Solution

The fourth proportional to 922.39, 1,272.44 and 643.07 is: 887.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.39 : 1,272.44 = 643.07 : x
  2. Step 2: Convert to fraction form
    922.39/1,272.44 = 643.07/x
  3. Step 3: Cross multiply
    922.39x = 1,272.44 × 643.07
  4. Step 4: Simplify right side
    922.39x = 818,272.78
  5. Step 5: Solve for x
    x = 818,272.78/922.39
  6. Step 6: Final answer
    x = 887.12

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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.