Home / 1,538.30-2,117.68-1,390.48

Finding the Fourth Proportional to 1,538.30, 2,117.68 and 1,390.48

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Solution

The fourth proportional to 1,538.30, 2,117.68 and 1,390.48 is: 1,914.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.30 : 2,117.68 = 1,390.48 : x
  2. Step 2: Convert to fraction form
    1,538.30/2,117.68 = 1,390.48/x
  3. Step 3: Cross multiply
    1,538.30x = 2,117.68 × 1,390.48
  4. Step 4: Simplify right side
    1,538.30x = 2,944,591.69
  5. Step 5: Solve for x
    x = 2,944,591.69/1,538.30
  6. Step 6: Final answer
    x = 1,914.19

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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.