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Finding the Fourth Proportional to 995.65, 1,374.57 and 665.17

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Solution

The fourth proportional to 995.65, 1,374.57 and 665.17 is: 918.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.65 : 1,374.57 = 665.17 : x
  2. Step 2: Convert to fraction form
    995.65/1,374.57 = 665.17/x
  3. Step 3: Cross multiply
    995.65x = 1,374.57 × 665.17
  4. Step 4: Simplify right side
    995.65x = 914,312.53
  5. Step 5: Solve for x
    x = 914,312.53/995.65
  6. Step 6: Final answer
    x = 918.31

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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.