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Finding the Fourth Proportional to 1,019.18, 1,406.47 and 553.43

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Solution

The fourth proportional to 1,019.18, 1,406.47 and 553.43 is: 763.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.18 : 1,406.47 = 553.43 : x
  2. Step 2: Convert to fraction form
    1,019.18/1,406.47 = 553.43/x
  3. Step 3: Cross multiply
    1,019.18x = 1,406.47 × 553.43
  4. Step 4: Simplify right side
    1,019.18x = 778,381.13
  5. Step 5: Solve for x
    x = 778,381.13/1,019.18
  6. Step 6: Final answer
    x = 763.73

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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.