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Finding the Fourth Proportional to 1,220.58, 1,830.35 and 757.67

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Solution

The fourth proportional to 1,220.58, 1,830.35 and 757.67 is: 1,136.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.58 : 1,830.35 = 757.67 : x
  2. Step 2: Convert to fraction form
    1,220.58/1,830.35 = 757.67/x
  3. Step 3: Cross multiply
    1,220.58x = 1,830.35 × 757.67
  4. Step 4: Simplify right side
    1,220.58x = 1,386,788.34
  5. Step 5: Solve for x
    x = 1,386,788.34/1,220.58
  6. Step 6: Final answer
    x = 1,136.17

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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.