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Finding the Fourth Proportional to 18,953.70, 28,430.16 and 8,420.86

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Solution

The fourth proportional to 18,953.70, 28,430.16 and 8,420.86 is: 12,631.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,953.70 : 28,430.16 = 8,420.86 : x
  2. Step 2: Convert to fraction form
    18,953.70/28,430.16 = 8,420.86/x
  3. Step 3: Cross multiply
    18,953.70x = 28,430.16 × 8,420.86
  4. Step 4: Simplify right side
    18,953.70x = 239,406,426.11
  5. Step 5: Solve for x
    x = 239,406,426.11/18,953.70
  6. Step 6: Final answer
    x = 12,631.12

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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.