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Finding the Fourth Proportional to 18,689.40, 28,077.30 and 12,857.40

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Solution

The fourth proportional to 18,689.40, 28,077.30 and 12,857.40 is: 19,315.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.40 : 28,077.30 = 12,857.40 : x
  2. Step 2: Convert to fraction form
    18,689.40/28,077.30 = 12,857.40/x
  3. Step 3: Cross multiply
    18,689.40x = 28,077.30 × 12,857.40
  4. Step 4: Simplify right side
    18,689.40x = 361,001,077.02
  5. Step 5: Solve for x
    x = 361,001,077.02/18,689.40
  6. Step 6: Final answer
    x = 19,315.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.