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Finding the Fourth Proportional to 253,281, 379,921.86 and 87,069

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Solution

The fourth proportional to 253,281, 379,921.86 and 87,069 is: 130,603.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    253,281 : 379,921.86 = 87,069 : x
  2. Step 2: Convert to fraction form
    253,281/379,921.86 = 87,069/x
  3. Step 3: Cross multiply
    253,281x = 379,921.86 × 87,069
  4. Step 4: Simplify right side
    253,281x = 33,079,416,428.34
  5. Step 5: Solve for x
    x = 33,079,416,428.34/253,281
  6. Step 6: Final answer
    x = 130,603.62

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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.