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Finding the Fourth Proportional to 12,458.70, 18,688.05 and 11,000.70

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Solution

The fourth proportional to 12,458.70, 18,688.05 and 11,000.70 is: 16,501.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,458.70 : 18,688.05 = 11,000.70 : x
  2. Step 2: Convert to fraction form
    12,458.70/18,688.05 = 11,000.70/x
  3. Step 3: Cross multiply
    12,458.70x = 18,688.05 × 11,000.70
  4. Step 4: Simplify right side
    12,458.70x = 205,581,631.64
  5. Step 5: Solve for x
    x = 205,581,631.64/12,458.70
  6. Step 6: Final answer
    x = 16,501.05

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Similar ratio
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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.