Home / 20,384.30-28,118.40-12,818.66

Finding the Fourth Proportional to 20,384.30, 28,118.40 and 12,818.66

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Solution

The fourth proportional to 20,384.30, 28,118.40 and 12,818.66 is: 17,682.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,384.30 : 28,118.40 = 12,818.66 : x
  2. Step 2: Convert to fraction form
    20,384.30/28,118.40 = 12,818.66/x
  3. Step 3: Cross multiply
    20,384.30x = 28,118.40 × 12,818.66
  4. Step 4: Simplify right side
    20,384.30x = 360,440,209.34
  5. Step 5: Solve for x
    x = 360,440,209.34/20,384.30
  6. Step 6: Final answer
    x = 17,682.25

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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.