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Finding the Fourth Proportional to 1,179.84, 1,627.32 and 917.28

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Solution

The fourth proportional to 1,179.84, 1,627.32 and 917.28 is: 1,265.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.84 : 1,627.32 = 917.28 : x
  2. Step 2: Convert to fraction form
    1,179.84/1,627.32 = 917.28/x
  3. Step 3: Cross multiply
    1,179.84x = 1,627.32 × 917.28
  4. Step 4: Simplify right side
    1,179.84x = 1,492,708.09
  5. Step 5: Solve for x
    x = 1,492,708.09/1,179.84
  6. Step 6: Final answer
    x = 1,265.18

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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.