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Finding the Fourth Proportional to 212,722.70, 319,062.45 and 72,479.30

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Solution

The fourth proportional to 212,722.70, 319,062.45 and 72,479.30 is: 108,711.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,722.70 : 319,062.45 = 72,479.30 : x
  2. Step 2: Convert to fraction form
    212,722.70/319,062.45 = 72,479.30/x
  3. Step 3: Cross multiply
    212,722.70x = 319,062.45 × 72,479.30
  4. Step 4: Simplify right side
    212,722.70x = 23,125,423,032.29
  5. Step 5: Solve for x
    x = 23,125,423,032.29/212,722.70
  6. Step 6: Final answer
    x = 108,711.59

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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.