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Finding the Fourth Proportional to 912.80, 1,259.43 and 553.70

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Solution

The fourth proportional to 912.80, 1,259.43 and 553.70 is: 763.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.80 : 1,259.43 = 553.70 : x
  2. Step 2: Convert to fraction form
    912.80/1,259.43 = 553.70/x
  3. Step 3: Cross multiply
    912.80x = 1,259.43 × 553.70
  4. Step 4: Simplify right side
    912.80x = 697,346.39
  5. Step 5: Solve for x
    x = 697,346.39/912.80
  6. Step 6: Final answer
    x = 763.96

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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.