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Finding the Fourth Proportional to 1,084.06, 1,495.65 and 691.21

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Solution

The fourth proportional to 1,084.06, 1,495.65 and 691.21 is: 953.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,084.06 : 1,495.65 = 691.21 : x
  2. Step 2: Convert to fraction form
    1,084.06/1,495.65 = 691.21/x
  3. Step 3: Cross multiply
    1,084.06x = 1,495.65 × 691.21
  4. Step 4: Simplify right side
    1,084.06x = 1,033,808.24
  5. Step 5: Solve for x
    x = 1,033,808.24/1,084.06
  6. Step 6: Final answer
    x = 953.64

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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.