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Finding the Fourth Proportional to 18,953.95, 28,430.53 and 8,421.11

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Solution

The fourth proportional to 18,953.95, 28,430.53 and 8,421.11 is: 12,631.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,953.95 : 28,430.53 = 8,421.11 : x
  2. Step 2: Convert to fraction form
    18,953.95/28,430.53 = 8,421.11/x
  3. Step 3: Cross multiply
    18,953.95x = 28,430.53 × 8,421.11
  4. Step 4: Simplify right side
    18,953.95x = 239,416,691.56
  5. Step 5: Solve for x
    x = 239,416,691.56/18,953.95
  6. Step 6: Final answer
    x = 12,631.49

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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.