Home / 1,210.42-1,815.20-624.80

Finding the Fourth Proportional to 1,210.42, 1,815.20 and 624.80

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Solution

The fourth proportional to 1,210.42, 1,815.20 and 624.80 is: 936.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.42 : 1,815.20 = 624.80 : x
  2. Step 2: Convert to fraction form
    1,210.42/1,815.20 = 624.80/x
  3. Step 3: Cross multiply
    1,210.42x = 1,815.20 × 624.80
  4. Step 4: Simplify right side
    1,210.42x = 1,134,136.96
  5. Step 5: Solve for x
    x = 1,134,136.96/1,210.42
  6. Step 6: Final answer
    x = 936.98

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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.