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Finding the Fourth Proportional to 1,008.86, 1,390.57 and 677.16

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Solution

The fourth proportional to 1,008.86, 1,390.57 and 677.16 is: 933.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.86 : 1,390.57 = 677.16 : x
  2. Step 2: Convert to fraction form
    1,008.86/1,390.57 = 677.16/x
  3. Step 3: Cross multiply
    1,008.86x = 1,390.57 × 677.16
  4. Step 4: Simplify right side
    1,008.86x = 941,636.69
  5. Step 5: Solve for x
    x = 941,636.69/1,008.86
  6. Step 6: Final answer
    x = 933.37

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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.