Home / 1,440.06-1,987.79-1,247.58

Finding the Fourth Proportional to 1,440.06, 1,987.79 and 1,247.58

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Solution

The fourth proportional to 1,440.06, 1,987.79 and 1,247.58 is: 1,722.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.06 : 1,987.79 = 1,247.58 : x
  2. Step 2: Convert to fraction form
    1,440.06/1,987.79 = 1,247.58/x
  3. Step 3: Cross multiply
    1,440.06x = 1,987.79 × 1,247.58
  4. Step 4: Simplify right side
    1,440.06x = 2,479,920.81
  5. Step 5: Solve for x
    x = 2,479,920.81/1,440.06
  6. Step 6: Final answer
    x = 1,722.10

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1.5x scale

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.