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Finding the Fourth Proportional to 909.68, 1,248.84 and 785.16

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Solution

The fourth proportional to 909.68, 1,248.84 and 785.16 is: 1,077.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.68 : 1,248.84 = 785.16 : x
  2. Step 2: Convert to fraction form
    909.68/1,248.84 = 785.16/x
  3. Step 3: Cross multiply
    909.68x = 1,248.84 × 785.16
  4. Step 4: Simplify right side
    909.68x = 980,539.21
  5. Step 5: Solve for x
    x = 980,539.21/909.68
  6. Step 6: Final answer
    x = 1,077.90

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.