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Finding the Fourth Proportional to 995.20, 1,491.59 and 561.45

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Solution

The fourth proportional to 995.20, 1,491.59 and 561.45 is: 841.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.20 : 1,491.59 = 561.45 : x
  2. Step 2: Convert to fraction form
    995.20/1,491.59 = 561.45/x
  3. Step 3: Cross multiply
    995.20x = 1,491.59 × 561.45
  4. Step 4: Simplify right side
    995.20x = 837,442.94
  5. Step 5: Solve for x
    x = 837,442.94/995.20
  6. Step 6: Final answer
    x = 841.48

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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.