Home / 12,891.28-19,341.40-6,656.40

Finding the Fourth Proportional to 12,891.28, 19,341.40 and 6,656.40

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Solution

The fourth proportional to 12,891.28, 19,341.40 and 6,656.40 is: 9,986.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.28 : 19,341.40 = 6,656.40 : x
  2. Step 2: Convert to fraction form
    12,891.28/19,341.40 = 6,656.40/x
  3. Step 3: Cross multiply
    12,891.28x = 19,341.40 × 6,656.40
  4. Step 4: Simplify right side
    12,891.28x = 128,744,094.96
  5. Step 5: Solve for x
    x = 128,744,094.96/12,891.28
  6. Step 6: Final answer
    x = 9,986.91

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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.