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Finding the Fourth Proportional to 909.99, 1,256.16 and 615.66

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Solution

The fourth proportional to 909.99, 1,256.16 and 615.66 is: 849.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.99 : 1,256.16 = 615.66 : x
  2. Step 2: Convert to fraction form
    909.99/1,256.16 = 615.66/x
  3. Step 3: Cross multiply
    909.99x = 1,256.16 × 615.66
  4. Step 4: Simplify right side
    909.99x = 773,367.47
  5. Step 5: Solve for x
    x = 773,367.47/909.99
  6. Step 6: Final answer
    x = 849.86

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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.