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Finding the Fourth Proportional to 989.91, 1,484.87 and 373.45

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Solution

The fourth proportional to 989.91, 1,484.87 and 373.45 is: 560.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.91 : 1,484.87 = 373.45 : x
  2. Step 2: Convert to fraction form
    989.91/1,484.87 = 373.45/x
  3. Step 3: Cross multiply
    989.91x = 1,484.87 × 373.45
  4. Step 4: Simplify right side
    989.91x = 554,524.70
  5. Step 5: Solve for x
    x = 554,524.70/989.91
  6. Step 6: Final answer
    x = 560.18

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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.