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Finding the Fourth Proportional to 78,889.80, 118,334.70 and 61,264.20

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Solution

The fourth proportional to 78,889.80, 118,334.70 and 61,264.20 is: 91,896.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,889.80 : 118,334.70 = 61,264.20 : x
  2. Step 2: Convert to fraction form
    78,889.80/118,334.70 = 61,264.20/x
  3. Step 3: Cross multiply
    78,889.80x = 118,334.70 × 61,264.20
  4. Step 4: Simplify right side
    78,889.80x = 7,249,680,727.74
  5. Step 5: Solve for x
    x = 7,249,680,727.74/78,889.80
  6. Step 6: Final answer
    x = 91,896.30

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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.