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Finding the Fourth Proportional to 12,585.70, 18,878.55 and 11,203.30

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Solution

The fourth proportional to 12,585.70, 18,878.55 and 11,203.30 is: 16,804.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,585.70 : 18,878.55 = 11,203.30 : x
  2. Step 2: Convert to fraction form
    12,585.70/18,878.55 = 11,203.30/x
  3. Step 3: Cross multiply
    12,585.70x = 18,878.55 × 11,203.30
  4. Step 4: Simplify right side
    12,585.70x = 211,502,059.22
  5. Step 5: Solve for x
    x = 211,502,059.22/12,585.70
  6. Step 6: Final answer
    x = 16,804.95

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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.