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Finding the Fourth Proportional to 1,477.88, 2,216.82 and 612.21

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Solution

The fourth proportional to 1,477.88, 2,216.82 and 612.21 is: 918.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,477.88 : 2,216.82 = 612.21 : x
  2. Step 2: Convert to fraction form
    1,477.88/2,216.82 = 612.21/x
  3. Step 3: Cross multiply
    1,477.88x = 2,216.82 × 612.21
  4. Step 4: Simplify right side
    1,477.88x = 1,357,159.37
  5. Step 5: Solve for x
    x = 1,357,159.37/1,477.88
  6. Step 6: Final answer
    x = 918.32

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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.