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Finding the Fourth Proportional to 138,636.70, 207,955.05 and 76,428.70

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Solution

The fourth proportional to 138,636.70, 207,955.05 and 76,428.70 is: 114,643.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,636.70 : 207,955.05 = 76,428.70 : x
  2. Step 2: Convert to fraction form
    138,636.70/207,955.05 = 76,428.70/x
  3. Step 3: Cross multiply
    138,636.70x = 207,955.05 × 76,428.70
  4. Step 4: Simplify right side
    138,636.70x = 15,893,734,129.94
  5. Step 5: Solve for x
    x = 15,893,734,129.94/138,636.70
  6. Step 6: Final answer
    x = 114,643.05

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1.5x scale

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.