Home / 1,206.10-1,809.15-686.26

Finding the Fourth Proportional to 1,206.10, 1,809.15 and 686.26

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Solution

The fourth proportional to 1,206.10, 1,809.15 and 686.26 is: 1,029.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.10 : 1,809.15 = 686.26 : x
  2. Step 2: Convert to fraction form
    1,206.10/1,809.15 = 686.26/x
  3. Step 3: Cross multiply
    1,206.10x = 1,809.15 × 686.26
  4. Step 4: Simplify right side
    1,206.10x = 1,241,547.28
  5. Step 5: Solve for x
    x = 1,241,547.28/1,206.10
  6. Step 6: Final answer
    x = 1,029.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.