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Finding the Fourth Proportional to 909.68, 1,365.12 and 678.83

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Solution

The fourth proportional to 909.68, 1,365.12 and 678.83 is: 1,018.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.68 : 1,365.12 = 678.83 : x
  2. Step 2: Convert to fraction form
    909.68/1,365.12 = 678.83/x
  3. Step 3: Cross multiply
    909.68x = 1,365.12 × 678.83
  4. Step 4: Simplify right side
    909.68x = 926,677.58
  5. Step 5: Solve for x
    x = 926,677.58/909.68
  6. Step 6: Final answer
    x = 1,018.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.