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Finding the Fourth Proportional to 212,611.73, 318,929.22 and 86,233.19

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Solution

The fourth proportional to 212,611.73, 318,929.22 and 86,233.19 is: 129,354.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,611.73 : 318,929.22 = 86,233.19 : x
  2. Step 2: Convert to fraction form
    212,611.73/318,929.22 = 86,233.19/x
  3. Step 3: Cross multiply
    212,611.73x = 318,929.22 × 86,233.19
  4. Step 4: Simplify right side
    212,611.73x = 27,502,282,430.17
  5. Step 5: Solve for x
    x = 27,502,282,430.17/212,611.73
  6. Step 6: Final answer
    x = 129,354.50

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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.