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Finding the Fourth Proportional to 18,752.40, 28,128.60 and 8,384.40

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Solution

The fourth proportional to 18,752.40, 28,128.60 and 8,384.40 is: 12,576.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,752.40 : 28,128.60 = 8,384.40 : x
  2. Step 2: Convert to fraction form
    18,752.40/28,128.60 = 8,384.40/x
  3. Step 3: Cross multiply
    18,752.40x = 28,128.60 × 8,384.40
  4. Step 4: Simplify right side
    18,752.40x = 235,841,433.84
  5. Step 5: Solve for x
    x = 235,841,433.84/18,752.40
  6. Step 6: Final answer
    x = 12,576.60

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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.