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Finding the Fourth Proportional to 212,969.80, 319,065.90 and 173,312.20

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Solution

The fourth proportional to 212,969.80, 319,065.90 and 173,312.20 is: 259,651.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,969.80 : 319,065.90 = 173,312.20 : x
  2. Step 2: Convert to fraction form
    212,969.80/319,065.90 = 173,312.20/x
  3. Step 3: Cross multiply
    212,969.80x = 319,065.90 × 173,312.20
  4. Step 4: Simplify right side
    212,969.80x = 55,298,013,073.98
  5. Step 5: Solve for x
    x = 55,298,013,073.98/212,969.80
  6. Step 6: Final answer
    x = 259,651.90

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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.