Home / 20,931.16-28,872.19-12,427.51

Finding the Fourth Proportional to 20,931.16, 28,872.19 and 12,427.51

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Solution

The fourth proportional to 20,931.16, 28,872.19 and 12,427.51 is: 17,142.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.16 : 28,872.19 = 12,427.51 : x
  2. Step 2: Convert to fraction form
    20,931.16/28,872.19 = 12,427.51/x
  3. Step 3: Cross multiply
    20,931.16x = 28,872.19 × 12,427.51
  4. Step 4: Simplify right side
    20,931.16x = 358,809,429.95
  5. Step 5: Solve for x
    x = 358,809,429.95/20,931.16
  6. Step 6: Final answer
    x = 17,142.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.