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Finding the Fourth Proportional to 171,945.12, 257,888.48 and 78,428.96

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Solution

The fourth proportional to 171,945.12, 257,888.48 and 78,428.96 is: 117,630.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,945.12 : 257,888.48 = 78,428.96 : x
  2. Step 2: Convert to fraction form
    171,945.12/257,888.48 = 78,428.96/x
  3. Step 3: Cross multiply
    171,945.12x = 257,888.48 × 78,428.96
  4. Step 4: Simplify right side
    171,945.12x = 20,225,925,282.38
  5. Step 5: Solve for x
    x = 20,225,925,282.38/171,945.12
  6. Step 6: Final answer
    x = 117,630.12

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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.