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Finding the Fourth Proportional to 212,636.59, 319,088.42 and 86,277.40

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Solution

The fourth proportional to 212,636.59, 319,088.42 and 86,277.40 is: 129,470.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,636.59 : 319,088.42 = 86,277.40 : x
  2. Step 2: Convert to fraction form
    212,636.59/319,088.42 = 86,277.40/x
  3. Step 3: Cross multiply
    212,636.59x = 319,088.42 × 86,277.40
  4. Step 4: Simplify right side
    212,636.59x = 27,530,118,665.68
  5. Step 5: Solve for x
    x = 27,530,118,665.68/212,636.59
  6. Step 6: Final answer
    x = 129,470.28

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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.