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Finding the Fourth Proportional to 1,172.07, 1,616.90 and 909.63

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Solution

The fourth proportional to 1,172.07, 1,616.90 and 909.63 is: 1,254.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.07 : 1,616.90 = 909.63 : x
  2. Step 2: Convert to fraction form
    1,172.07/1,616.90 = 909.63/x
  3. Step 3: Cross multiply
    1,172.07x = 1,616.90 × 909.63
  4. Step 4: Simplify right side
    1,172.07x = 1,470,776.20
  5. Step 5: Solve for x
    x = 1,470,776.20/1,172.07
  6. Step 6: Final answer
    x = 1,254.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.