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Finding the Fourth Proportional to 1,018.70, 1,405.80 and 552.95

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Solution

The fourth proportional to 1,018.70, 1,405.80 and 552.95 is: 763.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.70 : 1,405.80 = 552.95 : x
  2. Step 2: Convert to fraction form
    1,018.70/1,405.80 = 552.95/x
  3. Step 3: Cross multiply
    1,018.70x = 1,405.80 × 552.95
  4. Step 4: Simplify right side
    1,018.70x = 777,330.08
  5. Step 5: Solve for x
    x = 777,330.08/1,018.70
  6. Step 6: Final answer
    x = 763.06

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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.