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Finding the Fourth Proportional to 1,018.60, 1,405.68 and 552.86

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Solution

The fourth proportional to 1,018.60, 1,405.68 and 552.86 is: 762.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.60 : 1,405.68 = 552.86 : x
  2. Step 2: Convert to fraction form
    1,018.60/1,405.68 = 552.86/x
  3. Step 3: Cross multiply
    1,018.60x = 1,405.68 × 552.86
  4. Step 4: Simplify right side
    1,018.60x = 777,144.24
  5. Step 5: Solve for x
    x = 777,144.24/1,018.60
  6. Step 6: Final answer
    x = 762.95

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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.