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Finding the Fourth Proportional to 98,237.79, 147,357.72 and 78,640.92

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Solution

The fourth proportional to 98,237.79, 147,357.72 and 78,640.92 is: 117,962.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,237.79 : 147,357.72 = 78,640.92 : x
  2. Step 2: Convert to fraction form
    98,237.79/147,357.72 = 78,640.92/x
  3. Step 3: Cross multiply
    98,237.79x = 147,357.72 × 78,640.92
  4. Step 4: Simplify right side
    98,237.79x = 11,588,346,669.90
  5. Step 5: Solve for x
    x = 11,588,346,669.90/98,237.79
  6. Step 6: Final answer
    x = 117,962.21

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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.