Home / 1,421.20-2,127.36-901.72

Finding the Fourth Proportional to 1,421.20, 2,127.36 and 901.72

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Solution

The fourth proportional to 1,421.20, 2,127.36 and 901.72 is: 1,349.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.20 : 2,127.36 = 901.72 : x
  2. Step 2: Convert to fraction form
    1,421.20/2,127.36 = 901.72/x
  3. Step 3: Cross multiply
    1,421.20x = 2,127.36 × 901.72
  4. Step 4: Simplify right side
    1,421.20x = 1,918,283.06
  5. Step 5: Solve for x
    x = 1,918,283.06/1,421.20
  6. Step 6: Final answer
    x = 1,349.76

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1.5x scale

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.