Home / 12,921.64-19,369.84-6,688.72

Finding the Fourth Proportional to 12,921.64, 19,369.84 and 6,688.72

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Solution

The fourth proportional to 12,921.64, 19,369.84 and 6,688.72 is: 10,026.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,921.64 : 19,369.84 = 6,688.72 : x
  2. Step 2: Convert to fraction form
    12,921.64/19,369.84 = 6,688.72/x
  3. Step 3: Cross multiply
    12,921.64x = 19,369.84 × 6,688.72
  4. Step 4: Simplify right side
    12,921.64x = 129,559,436.20
  5. Step 5: Solve for x
    x = 129,559,436.20/12,921.64
  6. Step 6: Final answer
    x = 10,026.55

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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.