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Finding the Fourth Proportional to 904.87, 1,247.58 and 771.83

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Solution

The fourth proportional to 904.87, 1,247.58 and 771.83 is: 1,064.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.87 : 1,247.58 = 771.83 : x
  2. Step 2: Convert to fraction form
    904.87/1,247.58 = 771.83/x
  3. Step 3: Cross multiply
    904.87x = 1,247.58 × 771.83
  4. Step 4: Simplify right side
    904.87x = 962,915.94
  5. Step 5: Solve for x
    x = 962,915.94/904.87
  6. Step 6: Final answer
    x = 1,064.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.