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Finding the Fourth Proportional to 18,913.23, 28,373.92 and 9,430.72

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Solution

The fourth proportional to 18,913.23, 28,373.92 and 9,430.72 is: 14,148.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.23 : 28,373.92 = 9,430.72 : x
  2. Step 2: Convert to fraction form
    18,913.23/28,373.92 = 9,430.72/x
  3. Step 3: Cross multiply
    18,913.23x = 28,373.92 × 9,430.72
  4. Step 4: Simplify right side
    18,913.23x = 267,586,494.82
  5. Step 5: Solve for x
    x = 267,586,494.82/18,913.23
  6. Step 6: Final answer
    x = 14,148.11

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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.