Home / 20,987.46-31,492.14-8,516.70

Finding the Fourth Proportional to 20,987.46, 31,492.14 and 8,516.70

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Solution

The fourth proportional to 20,987.46, 31,492.14 and 8,516.70 is: 12,779.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.46 : 31,492.14 = 8,516.70 : x
  2. Step 2: Convert to fraction form
    20,987.46/31,492.14 = 8,516.70/x
  3. Step 3: Cross multiply
    20,987.46x = 31,492.14 × 8,516.70
  4. Step 4: Simplify right side
    20,987.46x = 268,209,108.74
  5. Step 5: Solve for x
    x = 268,209,108.74/20,987.46
  6. Step 6: Final answer
    x = 12,779.49

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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.