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Finding the Fourth Proportional to 1,326.18, 1,990.07 and 1,053.22

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Solution

The fourth proportional to 1,326.18, 1,990.07 and 1,053.22 is: 1,580.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.18 : 1,990.07 = 1,053.22 : x
  2. Step 2: Convert to fraction form
    1,326.18/1,990.07 = 1,053.22/x
  3. Step 3: Cross multiply
    1,326.18x = 1,990.07 × 1,053.22
  4. Step 4: Simplify right side
    1,326.18x = 2,095,981.53
  5. Step 5: Solve for x
    x = 2,095,981.53/1,326.18
  6. Step 6: Final answer
    x = 1,580.47

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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.