Home / 1,312.20-1,966.41-726.30

Finding the Fourth Proportional to 1,312.20, 1,966.41 and 726.30

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Solution

The fourth proportional to 1,312.20, 1,966.41 and 726.30 is: 1,088.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.20 : 1,966.41 = 726.30 : x
  2. Step 2: Convert to fraction form
    1,312.20/1,966.41 = 726.30/x
  3. Step 3: Cross multiply
    1,312.20x = 1,966.41 × 726.30
  4. Step 4: Simplify right side
    1,312.20x = 1,428,203.58
  5. Step 5: Solve for x
    x = 1,428,203.58/1,312.20
  6. Step 6: Final answer
    x = 1,088.40

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1.5x scale

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.