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Finding the Fourth Proportional to 994.74, 1,490.76 and 561.12

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Solution

The fourth proportional to 994.74, 1,490.76 and 561.12 is: 840.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.74 : 1,490.76 = 561.12 : x
  2. Step 2: Convert to fraction form
    994.74/1,490.76 = 561.12/x
  3. Step 3: Cross multiply
    994.74x = 1,490.76 × 561.12
  4. Step 4: Simplify right side
    994.74x = 836,495.25
  5. Step 5: Solve for x
    x = 836,495.25/994.74
  6. Step 6: Final answer
    x = 840.92

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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.