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Finding the Fourth Proportional to 909.84, 1,366.64 and 865.60

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Solution

The fourth proportional to 909.84, 1,366.64 and 865.60 is: 1,300.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.84 : 1,366.64 = 865.60 : x
  2. Step 2: Convert to fraction form
    909.84/1,366.64 = 865.60/x
  3. Step 3: Cross multiply
    909.84x = 1,366.64 × 865.60
  4. Step 4: Simplify right side
    909.84x = 1,182,959.09
  5. Step 5: Solve for x
    x = 1,182,959.09/909.84
  6. Step 6: Final answer
    x = 1,300.18

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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.