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Finding the Fourth Proportional to 1,172.55, 1,618.11 and 700.65

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Solution

The fourth proportional to 1,172.55, 1,618.11 and 700.65 is: 966.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.55 : 1,618.11 = 700.65 : x
  2. Step 2: Convert to fraction form
    1,172.55/1,618.11 = 700.65/x
  3. Step 3: Cross multiply
    1,172.55x = 1,618.11 × 700.65
  4. Step 4: Simplify right side
    1,172.55x = 1,133,728.77
  5. Step 5: Solve for x
    x = 1,133,728.77/1,172.55
  6. Step 6: Final answer
    x = 966.89

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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.