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Finding the Fourth Proportional to 994.95, 1,491.21 and 561.21

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Solution

The fourth proportional to 994.95, 1,491.21 and 561.21 is: 841.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.95 : 1,491.21 = 561.21 : x
  2. Step 2: Convert to fraction form
    994.95/1,491.21 = 561.21/x
  3. Step 3: Cross multiply
    994.95x = 1,491.21 × 561.21
  4. Step 4: Simplify right side
    994.95x = 836,881.96
  5. Step 5: Solve for x
    x = 836,881.96/994.95
  6. Step 6: Final answer
    x = 841.13

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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.