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Finding the Fourth Proportional to 1,018.68, 1,405.05 and 862.77

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Solution

The fourth proportional to 1,018.68, 1,405.05 and 862.77 is: 1,190.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.68 : 1,405.05 = 862.77 : x
  2. Step 2: Convert to fraction form
    1,018.68/1,405.05 = 862.77/x
  3. Step 3: Cross multiply
    1,018.68x = 1,405.05 × 862.77
  4. Step 4: Simplify right side
    1,018.68x = 1,212,234.99
  5. Step 5: Solve for x
    x = 1,212,234.99/1,018.68
  6. Step 6: Final answer
    x = 1,190.01

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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.