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Finding the Fourth Proportional to 887.79, 1,224.81 and 556.40

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Solution

The fourth proportional to 887.79, 1,224.81 and 556.40 is: 767.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.79 : 1,224.81 = 556.40 : x
  2. Step 2: Convert to fraction form
    887.79/1,224.81 = 556.40/x
  3. Step 3: Cross multiply
    887.79x = 1,224.81 × 556.40
  4. Step 4: Simplify right side
    887.79x = 681,486.09
  5. Step 5: Solve for x
    x = 681,486.09/887.79
  6. Step 6: Final answer
    x = 767.62

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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.