Home / 21,931.32-30,262.86-12,979.20

Finding the Fourth Proportional to 21,931.32, 30,262.86 and 12,979.20

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Solution

The fourth proportional to 21,931.32, 30,262.86 and 12,979.20 is: 17,909.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,931.32 : 30,262.86 = 12,979.20 : x
  2. Step 2: Convert to fraction form
    21,931.32/30,262.86 = 12,979.20/x
  3. Step 3: Cross multiply
    21,931.32x = 30,262.86 × 12,979.20
  4. Step 4: Simplify right side
    21,931.32x = 392,787,712.51
  5. Step 5: Solve for x
    x = 392,787,712.51/21,931.32
  6. Step 6: Final answer
    x = 17,909.90

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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.