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Finding the Fourth Proportional to 995.18, 1,490.74 and 561.42

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Solution

The fourth proportional to 995.18, 1,490.74 and 561.42 is: 840.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.18 : 1,490.74 = 561.42 : x
  2. Step 2: Convert to fraction form
    995.18/1,490.74 = 561.42/x
  3. Step 3: Cross multiply
    995.18x = 1,490.74 × 561.42
  4. Step 4: Simplify right side
    995.18x = 836,929.85
  5. Step 5: Solve for x
    x = 836,929.85/995.18
  6. Step 6: Final answer
    x = 840.99

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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.