Home / 1,681.40-2,321.46-1,239.80

Finding the Fourth Proportional to 1,681.40, 2,321.46 and 1,239.80

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Solution

The fourth proportional to 1,681.40, 2,321.46 and 1,239.80 is: 1,711.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.40 : 2,321.46 = 1,239.80 : x
  2. Step 2: Convert to fraction form
    1,681.40/2,321.46 = 1,239.80/x
  3. Step 3: Cross multiply
    1,681.40x = 2,321.46 × 1,239.80
  4. Step 4: Simplify right side
    1,681.40x = 2,878,146.11
  5. Step 5: Solve for x
    x = 2,878,146.11/1,681.40
  6. Step 6: Final answer
    x = 1,711.76

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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.