Home / 1,407.12-2,110.68-1,390.80

Finding the Fourth Proportional to 1,407.12, 2,110.68 and 1,390.80

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Solution

The fourth proportional to 1,407.12, 2,110.68 and 1,390.80 is: 2,086.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.12 : 2,110.68 = 1,390.80 : x
  2. Step 2: Convert to fraction form
    1,407.12/2,110.68 = 1,390.80/x
  3. Step 3: Cross multiply
    1,407.12x = 2,110.68 × 1,390.80
  4. Step 4: Simplify right side
    1,407.12x = 2,935,533.74
  5. Step 5: Solve for x
    x = 2,935,533.74/1,407.12
  6. Step 6: Final answer
    x = 2,086.20

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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.