Home / 21,816.76-30,106.74-12,385.12

Finding the Fourth Proportional to 21,816.76, 30,106.74 and 12,385.12

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Solution

The fourth proportional to 21,816.76, 30,106.74 and 12,385.12 is: 17,091.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,816.76 : 30,106.74 = 12,385.12 : x
  2. Step 2: Convert to fraction form
    21,816.76/30,106.74 = 12,385.12/x
  3. Step 3: Cross multiply
    21,816.76x = 30,106.74 × 12,385.12
  4. Step 4: Simplify right side
    21,816.76x = 372,875,587.71
  5. Step 5: Solve for x
    x = 372,875,587.71/21,816.76
  6. Step 6: Final answer
    x = 17,091.24

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Double scale
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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.