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Finding the Fourth Proportional to 89,636.40, 123,809.08 and 65,725.20

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Solution

The fourth proportional to 89,636.40, 123,809.08 and 65,725.20 is: 90,782.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,636.40 : 123,809.08 = 65,725.20 : x
  2. Step 2: Convert to fraction form
    89,636.40/123,809.08 = 65,725.20/x
  3. Step 3: Cross multiply
    89,636.40x = 123,809.08 × 65,725.20
  4. Step 4: Simplify right side
    89,636.40x = 8,137,376,544.82
  5. Step 5: Solve for x
    x = 8,137,376,544.82/89,636.40
  6. Step 6: Final answer
    x = 90,782.05

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1.5x scale

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.