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Finding the Fourth Proportional to 995.78, 1,493.67 and 509.18

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Solution

The fourth proportional to 995.78, 1,493.67 and 509.18 is: 763.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.78 : 1,493.67 = 509.18 : x
  2. Step 2: Convert to fraction form
    995.78/1,493.67 = 509.18/x
  3. Step 3: Cross multiply
    995.78x = 1,493.67 × 509.18
  4. Step 4: Simplify right side
    995.78x = 760,539.42
  5. Step 5: Solve for x
    x = 760,539.42/995.78
  6. Step 6: Final answer
    x = 763.77

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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.