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Finding the Fourth Proportional to 1,172.88, 1,618.38 and 707.13

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Solution

The fourth proportional to 1,172.88, 1,618.38 and 707.13 is: 975.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.88 : 1,618.38 = 707.13 : x
  2. Step 2: Convert to fraction form
    1,172.88/1,618.38 = 707.13/x
  3. Step 3: Cross multiply
    1,172.88x = 1,618.38 × 707.13
  4. Step 4: Simplify right side
    1,172.88x = 1,144,405.05
  5. Step 5: Solve for x
    x = 1,144,405.05/1,172.88
  6. Step 6: Final answer
    x = 975.72

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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.