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Finding the Fourth Proportional to 98,880.80, 148,175.40 and 84,009.20

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Solution

The fourth proportional to 98,880.80, 148,175.40 and 84,009.20 is: 125,889.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,880.80 : 148,175.40 = 84,009.20 : x
  2. Step 2: Convert to fraction form
    98,880.80/148,175.40 = 84,009.20/x
  3. Step 3: Cross multiply
    98,880.80x = 148,175.40 × 84,009.20
  4. Step 4: Simplify right side
    98,880.80x = 12,448,096,813.68
  5. Step 5: Solve for x
    x = 12,448,096,813.68/98,880.80
  6. Step 6: Final answer
    x = 125,889.93

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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.