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Finding the Fourth Proportional to 78,679.49, 108,617.90 and 53,319.87

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Solution

The fourth proportional to 78,679.49, 108,617.90 and 53,319.87 is: 73,608.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,679.49 : 108,617.90 = 53,319.87 : x
  2. Step 2: Convert to fraction form
    78,679.49/108,617.90 = 53,319.87/x
  3. Step 3: Cross multiply
    78,679.49x = 108,617.90 × 53,319.87
  4. Step 4: Simplify right side
    78,679.49x = 5,791,492,041.07
  5. Step 5: Solve for x
    x = 5,791,492,041.07/78,679.49
  6. Step 6: Final answer
    x = 73,608.67

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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.