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Finding the Fourth Proportional to 1,317.80, 1,975.80 and 624.80

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Solution

The fourth proportional to 1,317.80, 1,975.80 and 624.80 is: 936.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.80 : 1,975.80 = 624.80 : x
  2. Step 2: Convert to fraction form
    1,317.80/1,975.80 = 624.80/x
  3. Step 3: Cross multiply
    1,317.80x = 1,975.80 × 624.80
  4. Step 4: Simplify right side
    1,317.80x = 1,234,479.84
  5. Step 5: Solve for x
    x = 1,234,479.84/1,317.80
  6. Step 6: Final answer
    x = 936.77

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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.