Home / 1,116.17-1,538.70-783.56

Finding the Fourth Proportional to 1,116.17, 1,538.70 and 783.56

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Solution

The fourth proportional to 1,116.17, 1,538.70 and 783.56 is: 1,080.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.17 : 1,538.70 = 783.56 : x
  2. Step 2: Convert to fraction form
    1,116.17/1,538.70 = 783.56/x
  3. Step 3: Cross multiply
    1,116.17x = 1,538.70 × 783.56
  4. Step 4: Simplify right side
    1,116.17x = 1,205,663.77
  5. Step 5: Solve for x
    x = 1,205,663.77/1,116.17
  6. Step 6: Final answer
    x = 1,080.18

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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.