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Finding the Fourth Proportional to 713.78, 1,068.78 and 388.16

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Solution

The fourth proportional to 713.78, 1,068.78 and 388.16 is: 581.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.78 : 1,068.78 = 388.16 : x
  2. Step 2: Convert to fraction form
    713.78/1,068.78 = 388.16/x
  3. Step 3: Cross multiply
    713.78x = 1,068.78 × 388.16
  4. Step 4: Simplify right side
    713.78x = 414,857.64
  5. Step 5: Solve for x
    x = 414,857.64/713.78
  6. Step 6: Final answer
    x = 581.21

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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.