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Finding the Fourth Proportional to 1,477.60, 2,215.30 and 644.50

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Solution

The fourth proportional to 1,477.60, 2,215.30 and 644.50 is: 966.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,477.60 : 2,215.30 = 644.50 : x
  2. Step 2: Convert to fraction form
    1,477.60/2,215.30 = 644.50/x
  3. Step 3: Cross multiply
    1,477.60x = 2,215.30 × 644.50
  4. Step 4: Simplify right side
    1,477.60x = 1,427,757.63
  5. Step 5: Solve for x
    x = 1,427,757.63/1,477.60
  6. Step 6: Final answer
    x = 966.27

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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.