Home / 1,985.38-2,740.36-1,238.89

Finding the Fourth Proportional to 1,985.38, 2,740.36 and 1,238.89

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Solution

The fourth proportional to 1,985.38, 2,740.36 and 1,238.89 is: 1,710.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.38 : 2,740.36 = 1,238.89 : x
  2. Step 2: Convert to fraction form
    1,985.38/2,740.36 = 1,238.89/x
  3. Step 3: Cross multiply
    1,985.38x = 2,740.36 × 1,238.89
  4. Step 4: Simplify right side
    1,985.38x = 3,394,990.92
  5. Step 5: Solve for x
    x = 3,394,990.92/1,985.38
  6. Step 6: Final answer
    x = 1,710.00

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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.