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Finding the Fourth Proportional to 1,095.21, 1,641.80 and 401.70

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Solution

The fourth proportional to 1,095.21, 1,641.80 and 401.70 is: 602.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,095.21 : 1,641.80 = 401.70 : x
  2. Step 2: Convert to fraction form
    1,095.21/1,641.80 = 401.70/x
  3. Step 3: Cross multiply
    1,095.21x = 1,641.80 × 401.70
  4. Step 4: Simplify right side
    1,095.21x = 659,509.05
  5. Step 5: Solve for x
    x = 659,509.05/1,095.21
  6. Step 6: Final answer
    x = 602.18

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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.