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Finding the Fourth Proportional to 1,018.94, 1,406.12 and 553.20

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Solution

The fourth proportional to 1,018.94, 1,406.12 and 553.20 is: 763.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.94 : 1,406.12 = 553.20 : x
  2. Step 2: Convert to fraction form
    1,018.94/1,406.12 = 553.20/x
  3. Step 3: Cross multiply
    1,018.94x = 1,406.12 × 553.20
  4. Step 4: Simplify right side
    1,018.94x = 777,865.58
  5. Step 5: Solve for x
    x = 777,865.58/1,018.94
  6. Step 6: Final answer
    x = 763.41

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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.