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Finding the Fourth Proportional to 1,478.16, 2,216.70 and 612

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Solution

The fourth proportional to 1,478.16, 2,216.70 and 612 is: 917.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.16 : 2,216.70 = 612 : x
  2. Step 2: Convert to fraction form
    1,478.16/2,216.70 = 612/x
  3. Step 3: Cross multiply
    1,478.16x = 2,216.70 × 612
  4. Step 4: Simplify right side
    1,478.16x = 1,356,620.40
  5. Step 5: Solve for x
    x = 1,356,620.40/1,478.16
  6. Step 6: Final answer
    x = 917.78

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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.