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Finding the Fourth Proportional to 98,570.80, 147,856.20 and 78,887.80

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Solution

The fourth proportional to 98,570.80, 147,856.20 and 78,887.80 is: 118,331.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,570.80 : 147,856.20 = 78,887.80 : x
  2. Step 2: Convert to fraction form
    98,570.80/147,856.20 = 78,887.80/x
  3. Step 3: Cross multiply
    98,570.80x = 147,856.20 × 78,887.80
  4. Step 4: Simplify right side
    98,570.80x = 11,664,050,334.36
  5. Step 5: Solve for x
    x = 11,664,050,334.36/98,570.80
  6. Step 6: Final answer
    x = 118,331.70

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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.