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Finding the Fourth Proportional to 98,991.18, 136,572 and 65,018.07

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Solution

The fourth proportional to 98,991.18, 136,572 and 65,018.07 is: 89,701.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,991.18 : 136,572 = 65,018.07 : x
  2. Step 2: Convert to fraction form
    98,991.18/136,572 = 65,018.07/x
  3. Step 3: Cross multiply
    98,991.18x = 136,572 × 65,018.07
  4. Step 4: Simplify right side
    98,991.18x = 8,879,647,856.04
  5. Step 5: Solve for x
    x = 8,879,647,856.04/98,991.18
  6. Step 6: Final answer
    x = 89,701.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.