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Finding the Fourth Proportional to 909.76, 1,364.60 and 499.08

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Solution

The fourth proportional to 909.76, 1,364.60 and 499.08 is: 748.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.76 : 1,364.60 = 499.08 : x
  2. Step 2: Convert to fraction form
    909.76/1,364.60 = 499.08/x
  3. Step 3: Cross multiply
    909.76x = 1,364.60 × 499.08
  4. Step 4: Simplify right side
    909.76x = 681,044.57
  5. Step 5: Solve for x
    x = 681,044.57/909.76
  6. Step 6: Final answer
    x = 748.60

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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.