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Finding the Fourth Proportional to 13,458.30, 20,187.45 and 12,378.30

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Solution

The fourth proportional to 13,458.30, 20,187.45 and 12,378.30 is: 18,567.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,458.30 : 20,187.45 = 12,378.30 : x
  2. Step 2: Convert to fraction form
    13,458.30/20,187.45 = 12,378.30/x
  3. Step 3: Cross multiply
    13,458.30x = 20,187.45 × 12,378.30
  4. Step 4: Simplify right side
    13,458.30x = 249,886,312.34
  5. Step 5: Solve for x
    x = 249,886,312.34/13,458.30
  6. Step 6: Final answer
    x = 18,567.45

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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.