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Finding the Fourth Proportional to 1,018.86, 1,406.03 and 553.11

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Solution

The fourth proportional to 1,018.86, 1,406.03 and 553.11 is: 763.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.86 : 1,406.03 = 553.11 : x
  2. Step 2: Convert to fraction form
    1,018.86/1,406.03 = 553.11/x
  3. Step 3: Cross multiply
    1,018.86x = 1,406.03 × 553.11
  4. Step 4: Simplify right side
    1,018.86x = 777,686.49
  5. Step 5: Solve for x
    x = 777,686.49/1,018.86
  6. Step 6: Final answer
    x = 763.29

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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.