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Finding the Fourth Proportional to 205,639.80, 308,492.10 and 65,412.60

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Solution

The fourth proportional to 205,639.80, 308,492.10 and 65,412.60 is: 98,129.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,639.80 : 308,492.10 = 65,412.60 : x
  2. Step 2: Convert to fraction form
    205,639.80/308,492.10 = 65,412.60/x
  3. Step 3: Cross multiply
    205,639.80x = 308,492.10 × 65,412.60
  4. Step 4: Simplify right side
    205,639.80x = 20,179,270,340.46
  5. Step 5: Solve for x
    x = 20,179,270,340.46/205,639.80
  6. Step 6: Final answer
    x = 98,129.21

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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.