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Finding the Fourth Proportional to 835.40, 1,253.10 and 781.40

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Solution

The fourth proportional to 835.40, 1,253.10 and 781.40 is: 1,172.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.40 : 1,253.10 = 781.40 : x
  2. Step 2: Convert to fraction form
    835.40/1,253.10 = 781.40/x
  3. Step 3: Cross multiply
    835.40x = 1,253.10 × 781.40
  4. Step 4: Simplify right side
    835.40x = 979,172.34
  5. Step 5: Solve for x
    x = 979,172.34/835.40
  6. Step 6: Final answer
    x = 1,172.10

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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.