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Finding the Fourth Proportional to 908.60, 1,253.90 and 515.63

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Solution

The fourth proportional to 908.60, 1,253.90 and 515.63 is: 711.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.60 : 1,253.90 = 515.63 : x
  2. Step 2: Convert to fraction form
    908.60/1,253.90 = 515.63/x
  3. Step 3: Cross multiply
    908.60x = 1,253.90 × 515.63
  4. Step 4: Simplify right side
    908.60x = 646,539.61
  5. Step 5: Solve for x
    x = 646,539.61/908.60
  6. Step 6: Final answer
    x = 711.58

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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.