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Finding the Fourth Proportional to 1,866.79, 2,800.91 and 770.90

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Solution

The fourth proportional to 1,866.79, 2,800.91 and 770.90 is: 1,156.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,866.79 : 2,800.91 = 770.90 : x
  2. Step 2: Convert to fraction form
    1,866.79/2,800.91 = 770.90/x
  3. Step 3: Cross multiply
    1,866.79x = 2,800.91 × 770.90
  4. Step 4: Simplify right side
    1,866.79x = 2,159,203.66
  5. Step 5: Solve for x
    x = 2,159,203.66/1,866.79
  6. Step 6: Final answer
    x = 1,156.64

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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.