Home / 1,913.28-2,870.16-680.40

Finding the Fourth Proportional to 1,913.28, 2,870.16 and 680.40

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Solution

The fourth proportional to 1,913.28, 2,870.16 and 680.40 is: 1,020.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.28 : 2,870.16 = 680.40 : x
  2. Step 2: Convert to fraction form
    1,913.28/2,870.16 = 680.40/x
  3. Step 3: Cross multiply
    1,913.28x = 2,870.16 × 680.40
  4. Step 4: Simplify right side
    1,913.28x = 1,952,856.86
  5. Step 5: Solve for x
    x = 1,952,856.86/1,913.28
  6. Step 6: Final answer
    x = 1,020.69

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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.