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Finding the Fourth Proportional to 917.94, 1,376.78 and 478.70

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Solution

The fourth proportional to 917.94, 1,376.78 and 478.70 is: 717.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.94 : 1,376.78 = 478.70 : x
  2. Step 2: Convert to fraction form
    917.94/1,376.78 = 478.70/x
  3. Step 3: Cross multiply
    917.94x = 1,376.78 × 478.70
  4. Step 4: Simplify right side
    917.94x = 659,064.59
  5. Step 5: Solve for x
    x = 659,064.59/917.94
  6. Step 6: Final answer
    x = 717.98

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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.