Home / 7,121.20-10,681.80-1,856.20

Finding the Fourth Proportional to 7,121.20, 10,681.80 and 1,856.20

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Solution

The fourth proportional to 7,121.20, 10,681.80 and 1,856.20 is: 2,784.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.20 : 10,681.80 = 1,856.20 : x
  2. Step 2: Convert to fraction form
    7,121.20/10,681.80 = 1,856.20/x
  3. Step 3: Cross multiply
    7,121.20x = 10,681.80 × 1,856.20
  4. Step 4: Simplify right side
    7,121.20x = 19,827,557.16
  5. Step 5: Solve for x
    x = 19,827,557.16/7,121.20
  6. Step 6: Final answer
    x = 2,784.30

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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.