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Finding the Fourth Proportional to 70,279.40, 105,419.10 and 65,905.40

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Solution

The fourth proportional to 70,279.40, 105,419.10 and 65,905.40 is: 98,858.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,279.40 : 105,419.10 = 65,905.40 : x
  2. Step 2: Convert to fraction form
    70,279.40/105,419.10 = 65,905.40/x
  3. Step 3: Cross multiply
    70,279.40x = 105,419.10 × 65,905.40
  4. Step 4: Simplify right side
    70,279.40x = 6,947,687,953.14
  5. Step 5: Solve for x
    x = 6,947,687,953.14/70,279.40
  6. Step 6: Final answer
    x = 98,858.10

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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.