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Finding the Fourth Proportional to 13,459.95, 18,565.47 and 8,078.72

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Solution

The fourth proportional to 13,459.95, 18,565.47 and 8,078.72 is: 11,143.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,459.95 : 18,565.47 = 8,078.72 : x
  2. Step 2: Convert to fraction form
    13,459.95/18,565.47 = 8,078.72/x
  3. Step 3: Cross multiply
    13,459.95x = 18,565.47 × 8,078.72
  4. Step 4: Simplify right side
    13,459.95x = 149,985,140.97
  5. Step 5: Solve for x
    x = 149,985,140.97/13,459.95
  6. Step 6: Final answer
    x = 11,143.07

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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.