Home / 1,421.76-2,117.49-1,331.76

Finding the Fourth Proportional to 1,421.76, 2,117.49 and 1,331.76

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Solution

The fourth proportional to 1,421.76, 2,117.49 and 1,331.76 is: 1,983.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.76 : 2,117.49 = 1,331.76 : x
  2. Step 2: Convert to fraction form
    1,421.76/2,117.49 = 1,331.76/x
  3. Step 3: Cross multiply
    1,421.76x = 2,117.49 × 1,331.76
  4. Step 4: Simplify right side
    1,421.76x = 2,819,988.48
  5. Step 5: Solve for x
    x = 2,819,988.48/1,421.76
  6. Step 6: Final answer
    x = 1,983.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.