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Finding the Fourth Proportional to 777.57, 1,072.98 and 478.95

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Solution

The fourth proportional to 777.57, 1,072.98 and 478.95 is: 660.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.57 : 1,072.98 = 478.95 : x
  2. Step 2: Convert to fraction form
    777.57/1,072.98 = 478.95/x
  3. Step 3: Cross multiply
    777.57x = 1,072.98 × 478.95
  4. Step 4: Simplify right side
    777.57x = 513,903.77
  5. Step 5: Solve for x
    x = 513,903.77/777.57
  6. Step 6: Final answer
    x = 660.91

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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.