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Finding the Fourth Proportional to 1,479.90, 2,220.12 and 505.77

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Solution

The fourth proportional to 1,479.90, 2,220.12 and 505.77 is: 758.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.90 : 2,220.12 = 505.77 : x
  2. Step 2: Convert to fraction form
    1,479.90/2,220.12 = 505.77/x
  3. Step 3: Cross multiply
    1,479.90x = 2,220.12 × 505.77
  4. Step 4: Simplify right side
    1,479.90x = 1,122,870.09
  5. Step 5: Solve for x
    x = 1,122,870.09/1,479.90
  6. Step 6: Final answer
    x = 758.75

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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.