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Finding the Fourth Proportional to 990.90, 1,486.37 and 374.90

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Solution

The fourth proportional to 990.90, 1,486.37 and 374.90 is: 562.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.90 : 1,486.37 = 374.90 : x
  2. Step 2: Convert to fraction form
    990.90/1,486.37 = 374.90/x
  3. Step 3: Cross multiply
    990.90x = 1,486.37 × 374.90
  4. Step 4: Simplify right side
    990.90x = 557,230.81
  5. Step 5: Solve for x
    x = 557,230.81/990.90
  6. Step 6: Final answer
    x = 562.35

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1.5x scale

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.