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Finding the Fourth Proportional to 990.68, 1,485.25 and 374.90

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Solution

The fourth proportional to 990.68, 1,485.25 and 374.90 is: 562.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.68 : 1,485.25 = 374.90 : x
  2. Step 2: Convert to fraction form
    990.68/1,485.25 = 374.90/x
  3. Step 3: Cross multiply
    990.68x = 1,485.25 × 374.90
  4. Step 4: Simplify right side
    990.68x = 556,811.86
  5. Step 5: Solve for x
    x = 556,811.86/990.68
  6. Step 6: Final answer
    x = 562.05

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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.