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Finding the Fourth Proportional to 1,018.87, 1,406.12 and 646.13

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Solution

The fourth proportional to 1,018.87, 1,406.12 and 646.13 is: 891.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.87 : 1,406.12 = 646.13 : x
  2. Step 2: Convert to fraction form
    1,018.87/1,406.12 = 646.13/x
  3. Step 3: Cross multiply
    1,018.87x = 1,406.12 × 646.13
  4. Step 4: Simplify right side
    1,018.87x = 908,536.60
  5. Step 5: Solve for x
    x = 908,536.60/1,018.87
  6. Step 6: Final answer
    x = 891.71

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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.