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Finding the Fourth Proportional to 710.72, 1,066.22 and 345.30

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Solution

The fourth proportional to 710.72, 1,066.22 and 345.30 is: 518.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.72 : 1,066.22 = 345.30 : x
  2. Step 2: Convert to fraction form
    710.72/1,066.22 = 345.30/x
  3. Step 3: Cross multiply
    710.72x = 1,066.22 × 345.30
  4. Step 4: Simplify right side
    710.72x = 368,165.77
  5. Step 5: Solve for x
    x = 368,165.77/710.72
  6. Step 6: Final answer
    x = 518.02

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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.