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Finding the Fourth Proportional to 78,856.64, 118,077.60 and 60,401.60

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Solution

The fourth proportional to 78,856.64, 118,077.60 and 60,401.60 is: 90,443.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,856.64 : 118,077.60 = 60,401.60 : x
  2. Step 2: Convert to fraction form
    78,856.64/118,077.60 = 60,401.60/x
  3. Step 3: Cross multiply
    78,856.64x = 118,077.60 × 60,401.60
  4. Step 4: Simplify right side
    78,856.64x = 7,132,075,964.16
  5. Step 5: Solve for x
    x = 7,132,075,964.16/78,856.64
  6. Step 6: Final answer
    x = 90,443.57

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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.