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Finding the Fourth Proportional to 713.05, 1,068.42 and 438.58

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Solution

The fourth proportional to 713.05, 1,068.42 and 438.58 is: 657.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.05 : 1,068.42 = 438.58 : x
  2. Step 2: Convert to fraction form
    713.05/1,068.42 = 438.58/x
  3. Step 3: Cross multiply
    713.05x = 1,068.42 × 438.58
  4. Step 4: Simplify right side
    713.05x = 468,587.64
  5. Step 5: Solve for x
    x = 468,587.64/713.05
  6. Step 6: Final answer
    x = 657.16

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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.