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Finding the Fourth Proportional to 212,240, 317,574.72 and 128,048.96

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Solution

The fourth proportional to 212,240, 317,574.72 and 128,048.96 is: 191,599.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,240 : 317,574.72 = 128,048.96 : x
  2. Step 2: Convert to fraction form
    212,240/317,574.72 = 128,048.96/x
  3. Step 3: Cross multiply
    212,240x = 317,574.72 × 128,048.96
  4. Step 4: Simplify right side
    212,240x = 40,665,112,618.29
  5. Step 5: Solve for x
    x = 40,665,112,618.29/212,240
  6. Step 6: Final answer
    x = 191,599.66

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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.