Home / 21,981.64-30,331.86-12,547.72

Finding the Fourth Proportional to 21,981.64, 30,331.86 and 12,547.72

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Solution

The fourth proportional to 21,981.64, 30,331.86 and 12,547.72 is: 17,314.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,981.64 : 30,331.86 = 12,547.72 : x
  2. Step 2: Convert to fraction form
    21,981.64/30,331.86 = 12,547.72/x
  3. Step 3: Cross multiply
    21,981.64x = 30,331.86 × 12,547.72
  4. Step 4: Simplify right side
    21,981.64x = 380,595,686.36
  5. Step 5: Solve for x
    x = 380,595,686.36/21,981.64
  6. Step 6: Final answer
    x = 17,314.25

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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.