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Finding the Fourth Proportional to 70,447.36, 105,670.16 and 17,139.64

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Solution

The fourth proportional to 70,447.36, 105,670.16 and 17,139.64 is: 25,709.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,447.36 : 105,670.16 = 17,139.64 : x
  2. Step 2: Convert to fraction form
    70,447.36/105,670.16 = 17,139.64/x
  3. Step 3: Cross multiply
    70,447.36x = 105,670.16 × 17,139.64
  4. Step 4: Simplify right side
    70,447.36x = 1,811,148,501.14
  5. Step 5: Solve for x
    x = 1,811,148,501.14/70,447.36
  6. Step 6: Final answer
    x = 25,709.25

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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.