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Finding the Fourth Proportional to 1,117.74, 1,539.18 and 959.22

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Solution

The fourth proportional to 1,117.74, 1,539.18 and 959.22 is: 1,320.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.74 : 1,539.18 = 959.22 : x
  2. Step 2: Convert to fraction form
    1,117.74/1,539.18 = 959.22/x
  3. Step 3: Cross multiply
    1,117.74x = 1,539.18 × 959.22
  4. Step 4: Simplify right side
    1,117.74x = 1,476,412.24
  5. Step 5: Solve for x
    x = 1,476,412.24/1,117.74
  6. Step 6: Final answer
    x = 1,320.89

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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.