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Finding the Fourth Proportional to 98,986.80, 148,285.80 and 91,988.40

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Solution

The fourth proportional to 98,986.80, 148,285.80 and 91,988.40 is: 137,801.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,986.80 : 148,285.80 = 91,988.40 : x
  2. Step 2: Convert to fraction form
    98,986.80/148,285.80 = 91,988.40/x
  3. Step 3: Cross multiply
    98,986.80x = 148,285.80 × 91,988.40
  4. Step 4: Simplify right side
    98,986.80x = 13,640,573,484.72
  5. Step 5: Solve for x
    x = 13,640,573,484.72/98,986.80
  6. Step 6: Final answer
    x = 137,801.94

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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.