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Finding the Fourth Proportional to 13,640.58, 18,830.64 and 8,612.10

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Solution

The fourth proportional to 13,640.58, 18,830.64 and 8,612.10 is: 11,888.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,640.58 : 18,830.64 = 8,612.10 : x
  2. Step 2: Convert to fraction form
    13,640.58/18,830.64 = 8,612.10/x
  3. Step 3: Cross multiply
    13,640.58x = 18,830.64 × 8,612.10
  4. Step 4: Simplify right side
    13,640.58x = 162,171,354.74
  5. Step 5: Solve for x
    x = 162,171,354.74/13,640.58
  6. Step 6: Final answer
    x = 11,888.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.