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Finding the Fourth Proportional to 1,019.54, 1,406.95 and 553.79

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Solution

The fourth proportional to 1,019.54, 1,406.95 and 553.79 is: 764.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.54 : 1,406.95 = 553.79 : x
  2. Step 2: Convert to fraction form
    1,019.54/1,406.95 = 553.79/x
  3. Step 3: Cross multiply
    1,019.54x = 1,406.95 × 553.79
  4. Step 4: Simplify right side
    1,019.54x = 779,156.97
  5. Step 5: Solve for x
    x = 779,156.97/1,019.54
  6. Step 6: Final answer
    x = 764.22

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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.