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Finding the Fourth Proportional to 782.11, 1,172.40 and 435.61

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Solution

The fourth proportional to 782.11, 1,172.40 and 435.61 is: 652.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.11 : 1,172.40 = 435.61 : x
  2. Step 2: Convert to fraction form
    782.11/1,172.40 = 435.61/x
  3. Step 3: Cross multiply
    782.11x = 1,172.40 × 435.61
  4. Step 4: Simplify right side
    782.11x = 510,709.16
  5. Step 5: Solve for x
    x = 510,709.16/782.11
  6. Step 6: Final answer
    x = 652.99

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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.