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Finding the Fourth Proportional to 15,143.59, 20,886.29 and 9,840.13

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Solution

The fourth proportional to 15,143.59, 20,886.29 and 9,840.13 is: 13,571.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,143.59 : 20,886.29 = 9,840.13 : x
  2. Step 2: Convert to fraction form
    15,143.59/20,886.29 = 9,840.13/x
  3. Step 3: Cross multiply
    15,143.59x = 20,886.29 × 9,840.13
  4. Step 4: Simplify right side
    15,143.59x = 205,523,808.82
  5. Step 5: Solve for x
    x = 205,523,808.82/15,143.59
  6. Step 6: Final answer
    x = 13,571.67

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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.