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Finding the Fourth Proportional to 212,815.80, 319,223.70 and 86,455.80

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Solution

The fourth proportional to 212,815.80, 319,223.70 and 86,455.80 is: 129,683.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,815.80 : 319,223.70 = 86,455.80 : x
  2. Step 2: Convert to fraction form
    212,815.80/319,223.70 = 86,455.80/x
  3. Step 3: Cross multiply
    212,815.80x = 319,223.70 × 86,455.80
  4. Step 4: Simplify right side
    212,815.80x = 27,598,740,362.46
  5. Step 5: Solve for x
    x = 27,598,740,362.46/212,815.80
  6. Step 6: Final answer
    x = 129,683.70

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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.