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Finding the Fourth Proportional to 1,290.03, 1,779.54 and 1,113.72

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Solution

The fourth proportional to 1,290.03, 1,779.54 and 1,113.72 is: 1,536.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.03 : 1,779.54 = 1,113.72 : x
  2. Step 2: Convert to fraction form
    1,290.03/1,779.54 = 1,113.72/x
  3. Step 3: Cross multiply
    1,290.03x = 1,779.54 × 1,113.72
  4. Step 4: Simplify right side
    1,290.03x = 1,981,909.29
  5. Step 5: Solve for x
    x = 1,981,909.29/1,290.03
  6. Step 6: Final answer
    x = 1,536.33

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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.