Home / 212,139.81-317,999.52-99,618.61

Finding the Fourth Proportional to 212,139.81, 317,999.52 and 99,618.61

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Solution

The fourth proportional to 212,139.81, 317,999.52 and 99,618.61 is: 149,329.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,139.81 : 317,999.52 = 99,618.61 : x
  2. Step 2: Convert to fraction form
    212,139.81/317,999.52 = 99,618.61/x
  3. Step 3: Cross multiply
    212,139.81x = 317,999.52 × 99,618.61
  4. Step 4: Simplify right side
    212,139.81x = 31,678,669,350.12
  5. Step 5: Solve for x
    x = 31,678,669,350.12/212,139.81
  6. Step 6: Final answer
    x = 149,329.20

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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.