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Finding the Fourth Proportional to 319,991.40, 479,549.70 and 213,071.40

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Solution

The fourth proportional to 319,991.40, 479,549.70 and 213,071.40 is: 319,315.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,991.40 : 479,549.70 = 213,071.40 : x
  2. Step 2: Convert to fraction form
    319,991.40/479,549.70 = 213,071.40/x
  3. Step 3: Cross multiply
    319,991.40x = 479,549.70 × 213,071.40
  4. Step 4: Simplify right side
    319,991.40x = 102,178,325,948.58
  5. Step 5: Solve for x
    x = 102,178,325,948.58/319,991.40
  6. Step 6: Final answer
    x = 319,315.85

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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.