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Finding the Fourth Proportional to 212,816.80, 319,225.20 and 86,456.80

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Solution

The fourth proportional to 212,816.80, 319,225.20 and 86,456.80 is: 129,685.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,816.80 : 319,225.20 = 86,456.80 : x
  2. Step 2: Convert to fraction form
    212,816.80/319,225.20 = 86,456.80/x
  3. Step 3: Cross multiply
    212,816.80x = 319,225.20 × 86,456.80
  4. Step 4: Simplify right side
    212,816.80x = 27,599,189,271.36
  5. Step 5: Solve for x
    x = 27,599,189,271.36/212,816.80
  6. Step 6: Final answer
    x = 129,685.20

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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.