Home / 1,415.20-2,125.20-930.40

Finding the Fourth Proportional to 1,415.20, 2,125.20 and 930.40

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Solution

The fourth proportional to 1,415.20, 2,125.20 and 930.40 is: 1,397.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.20 : 2,125.20 = 930.40 : x
  2. Step 2: Convert to fraction form
    1,415.20/2,125.20 = 930.40/x
  3. Step 3: Cross multiply
    1,415.20x = 2,125.20 × 930.40
  4. Step 4: Simplify right side
    1,415.20x = 1,977,286.08
  5. Step 5: Solve for x
    x = 1,977,286.08/1,415.20
  6. Step 6: Final answer
    x = 1,397.18

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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.