Home / 1,318.50-1,818.54-1,109.79

Finding the Fourth Proportional to 1,318.50, 1,818.54 and 1,109.79

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Solution

The fourth proportional to 1,318.50, 1,818.54 and 1,109.79 is: 1,530.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.50 : 1,818.54 = 1,109.79 : x
  2. Step 2: Convert to fraction form
    1,318.50/1,818.54 = 1,109.79/x
  3. Step 3: Cross multiply
    1,318.50x = 1,818.54 × 1,109.79
  4. Step 4: Simplify right side
    1,318.50x = 2,018,197.51
  5. Step 5: Solve for x
    x = 2,018,197.51/1,318.50
  6. Step 6: Final answer
    x = 1,530.68

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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.