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Finding the Fourth Proportional to 989.63, 1,484.95 and 434.72

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Solution

The fourth proportional to 989.63, 1,484.95 and 434.72 is: 652.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.63 : 1,484.95 = 434.72 : x
  2. Step 2: Convert to fraction form
    989.63/1,484.95 = 434.72/x
  3. Step 3: Cross multiply
    989.63x = 1,484.95 × 434.72
  4. Step 4: Simplify right side
    989.63x = 645,540.09
  5. Step 5: Solve for x
    x = 645,540.09/989.63
  6. Step 6: Final answer
    x = 652.31

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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.