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Finding the Fourth Proportional to 711.62, 1,066.45 and 345.72

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Solution

The fourth proportional to 711.62, 1,066.45 and 345.72 is: 518.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.62 : 1,066.45 = 345.72 : x
  2. Step 2: Convert to fraction form
    711.62/1,066.45 = 345.72/x
  3. Step 3: Cross multiply
    711.62x = 1,066.45 × 345.72
  4. Step 4: Simplify right side
    711.62x = 368,693.09
  5. Step 5: Solve for x
    x = 368,693.09/711.62
  6. Step 6: Final answer
    x = 518.10

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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.