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Finding the Fourth Proportional to 1,095.09, 1,642.53 and 315.22

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Solution

The fourth proportional to 1,095.09, 1,642.53 and 315.22 is: 472.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,095.09 : 1,642.53 = 315.22 : x
  2. Step 2: Convert to fraction form
    1,095.09/1,642.53 = 315.22/x
  3. Step 3: Cross multiply
    1,095.09x = 1,642.53 × 315.22
  4. Step 4: Simplify right side
    1,095.09x = 517,752.07
  5. Step 5: Solve for x
    x = 517,752.07/1,095.09
  6. Step 6: Final answer
    x = 472.79

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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.