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Finding the Fourth Proportional to 784.34, 1,175.98 and 345.59

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Solution

The fourth proportional to 784.34, 1,175.98 and 345.59 is: 518.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.34 : 1,175.98 = 345.59 : x
  2. Step 2: Convert to fraction form
    784.34/1,175.98 = 345.59/x
  3. Step 3: Cross multiply
    784.34x = 1,175.98 × 345.59
  4. Step 4: Simplify right side
    784.34x = 406,406.93
  5. Step 5: Solve for x
    x = 406,406.93/784.34
  6. Step 6: Final answer
    x = 518.15

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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.