Home / 1,386.90-1,916.36-1,109.42

Finding the Fourth Proportional to 1,386.90, 1,916.36 and 1,109.42

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Solution

The fourth proportional to 1,386.90, 1,916.36 and 1,109.42 is: 1,532.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.90 : 1,916.36 = 1,109.42 : x
  2. Step 2: Convert to fraction form
    1,386.90/1,916.36 = 1,109.42/x
  3. Step 3: Cross multiply
    1,386.90x = 1,916.36 × 1,109.42
  4. Step 4: Simplify right side
    1,386.90x = 2,126,048.11
  5. Step 5: Solve for x
    x = 2,126,048.11/1,386.90
  6. Step 6: Final answer
    x = 1,532.95

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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.