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Finding the Fourth Proportional to 990.44, 1,484.96 and 434.88

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Solution

The fourth proportional to 990.44, 1,484.96 and 434.88 is: 652.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.44 : 1,484.96 = 434.88 : x
  2. Step 2: Convert to fraction form
    990.44/1,484.96 = 434.88/x
  3. Step 3: Cross multiply
    990.44x = 1,484.96 × 434.88
  4. Step 4: Simplify right side
    990.44x = 645,779.40
  5. Step 5: Solve for x
    x = 645,779.40/990.44
  6. Step 6: Final answer
    x = 652.01

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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.