Home / 1,419.18-2,127.61-638.77

Finding the Fourth Proportional to 1,419.18, 2,127.61 and 638.77

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Solution

The fourth proportional to 1,419.18, 2,127.61 and 638.77 is: 957.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.18 : 2,127.61 = 638.77 : x
  2. Step 2: Convert to fraction form
    1,419.18/2,127.61 = 638.77/x
  3. Step 3: Cross multiply
    1,419.18x = 2,127.61 × 638.77
  4. Step 4: Simplify right side
    1,419.18x = 1,359,053.44
  5. Step 5: Solve for x
    x = 1,359,053.44/1,419.18
  6. Step 6: Final answer
    x = 957.63

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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.