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Finding the Fourth Proportional to 2,990.50, 4,485.93 and 910.58

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Solution

The fourth proportional to 2,990.50, 4,485.93 and 910.58 is: 1,365.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.50 : 4,485.93 = 910.58 : x
  2. Step 2: Convert to fraction form
    2,990.50/4,485.93 = 910.58/x
  3. Step 3: Cross multiply
    2,990.50x = 4,485.93 × 910.58
  4. Step 4: Simplify right side
    2,990.50x = 4,084,777.42
  5. Step 5: Solve for x
    x = 4,084,777.42/2,990.50
  6. Step 6: Final answer
    x = 1,365.92

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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.