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Finding the Fourth Proportional to 990.53, 1,485.34 and 374.07

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Solution

The fourth proportional to 990.53, 1,485.34 and 374.07 is: 560.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.53 : 1,485.34 = 374.07 : x
  2. Step 2: Convert to fraction form
    990.53/1,485.34 = 374.07/x
  3. Step 3: Cross multiply
    990.53x = 1,485.34 × 374.07
  4. Step 4: Simplify right side
    990.53x = 555,617.41
  5. Step 5: Solve for x
    x = 555,617.41/990.53
  6. Step 6: Final answer
    x = 560.93

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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.