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Finding the Fourth Proportional to 1,290.21, 1,780.50 and 700.77

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Solution

The fourth proportional to 1,290.21, 1,780.50 and 700.77 is: 967.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.21 : 1,780.50 = 700.77 : x
  2. Step 2: Convert to fraction form
    1,290.21/1,780.50 = 700.77/x
  3. Step 3: Cross multiply
    1,290.21x = 1,780.50 × 700.77
  4. Step 4: Simplify right side
    1,290.21x = 1,247,720.99
  5. Step 5: Solve for x
    x = 1,247,720.99/1,290.21
  6. Step 6: Final answer
    x = 967.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.