Home / 1,386.30-2,079.45-1,247.10

Finding the Fourth Proportional to 1,386.30, 2,079.45 and 1,247.10

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Solution

The fourth proportional to 1,386.30, 2,079.45 and 1,247.10 is: 1,870.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.30 : 2,079.45 = 1,247.10 : x
  2. Step 2: Convert to fraction form
    1,386.30/2,079.45 = 1,247.10/x
  3. Step 3: Cross multiply
    1,386.30x = 2,079.45 × 1,247.10
  4. Step 4: Simplify right side
    1,386.30x = 2,593,282.10
  5. Step 5: Solve for x
    x = 2,593,282.10/1,386.30
  6. Step 6: Final answer
    x = 1,870.65

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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.