Home / 1,113.23-1,536.90-990.20

Finding the Fourth Proportional to 1,113.23, 1,536.90 and 990.20

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Solution

The fourth proportional to 1,113.23, 1,536.90 and 990.20 is: 1,367.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.23 : 1,536.90 = 990.20 : x
  2. Step 2: Convert to fraction form
    1,113.23/1,536.90 = 990.20/x
  3. Step 3: Cross multiply
    1,113.23x = 1,536.90 × 990.20
  4. Step 4: Simplify right side
    1,113.23x = 1,521,830.70
  5. Step 5: Solve for x
    x = 1,521,830.70/1,113.23
  6. Step 6: Final answer
    x = 1,367.05

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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.