Home / 1,421.52-2,127.81-899.70

Finding the Fourth Proportional to 1,421.52, 2,127.81 and 899.70

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Solution

The fourth proportional to 1,421.52, 2,127.81 and 899.70 is: 1,346.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.52 : 2,127.81 = 899.70 : x
  2. Step 2: Convert to fraction form
    1,421.52/2,127.81 = 899.70/x
  3. Step 3: Cross multiply
    1,421.52x = 2,127.81 × 899.70
  4. Step 4: Simplify right side
    1,421.52x = 1,914,390.66
  5. Step 5: Solve for x
    x = 1,914,390.66/1,421.52
  6. Step 6: Final answer
    x = 1,346.72

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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.