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Finding the Fourth Proportional to 98,430.80, 147,424.61 and 68,980.11

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Solution

The fourth proportional to 98,430.80, 147,424.61 and 68,980.11 is: 103,314.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,430.80 : 147,424.61 = 68,980.11 : x
  2. Step 2: Convert to fraction form
    98,430.80/147,424.61 = 68,980.11/x
  3. Step 3: Cross multiply
    98,430.80x = 147,424.61 × 68,980.11
  4. Step 4: Simplify right side
    98,430.80x = 10,169,365,046.10
  5. Step 5: Solve for x
    x = 10,169,365,046.10/98,430.80
  6. Step 6: Final answer
    x = 103,314.87

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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.