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Finding the Fourth Proportional to 753.76, 1,128.72 and 368

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Solution

The fourth proportional to 753.76, 1,128.72 and 368 is: 551.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.76 : 1,128.72 = 368 : x
  2. Step 2: Convert to fraction form
    753.76/1,128.72 = 368/x
  3. Step 3: Cross multiply
    753.76x = 1,128.72 × 368
  4. Step 4: Simplify right side
    753.76x = 415,368.96
  5. Step 5: Solve for x
    x = 415,368.96/753.76
  6. Step 6: Final answer
    x = 551.06

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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.