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Finding the Fourth Proportional to 990.50, 1,485.99 and 374.20

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Solution

The fourth proportional to 990.50, 1,485.99 and 374.20 is: 561.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.50 : 1,485.99 = 374.20 : x
  2. Step 2: Convert to fraction form
    990.50/1,485.99 = 374.20/x
  3. Step 3: Cross multiply
    990.50x = 1,485.99 × 374.20
  4. Step 4: Simplify right side
    990.50x = 556,053.74
  5. Step 5: Solve for x
    x = 556,053.74/990.50
  6. Step 6: Final answer
    x = 561.39

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Double scale
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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.