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Finding the Fourth Proportional to 1,090.62, 1,639.71 and 875.70

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Solution

The fourth proportional to 1,090.62, 1,639.71 and 875.70 is: 1,316.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.62 : 1,639.71 = 875.70 : x
  2. Step 2: Convert to fraction form
    1,090.62/1,639.71 = 875.70/x
  3. Step 3: Cross multiply
    1,090.62x = 1,639.71 × 875.70
  4. Step 4: Simplify right side
    1,090.62x = 1,435,894.05
  5. Step 5: Solve for x
    x = 1,435,894.05/1,090.62
  6. Step 6: Final answer
    x = 1,316.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.