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Finding the Fourth Proportional to 18,688.60, 28,031.88 and 7,000.96

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Solution

The fourth proportional to 18,688.60, 28,031.88 and 7,000.96 is: 10,501.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688.60 : 28,031.88 = 7,000.96 : x
  2. Step 2: Convert to fraction form
    18,688.60/28,031.88 = 7,000.96/x
  3. Step 3: Cross multiply
    18,688.60x = 28,031.88 × 7,000.96
  4. Step 4: Simplify right side
    18,688.60x = 196,250,070.60
  5. Step 5: Solve for x
    x = 196,250,070.60/18,688.60
  6. Step 6: Final answer
    x = 10,501.06

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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.