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Finding the Fourth Proportional to 1,290.20, 1,780.49 and 700.74

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Solution

The fourth proportional to 1,290.20, 1,780.49 and 700.74 is: 967.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.20 : 1,780.49 = 700.74 : x
  2. Step 2: Convert to fraction form
    1,290.20/1,780.49 = 700.74/x
  3. Step 3: Cross multiply
    1,290.20x = 1,780.49 × 700.74
  4. Step 4: Simplify right side
    1,290.20x = 1,247,657.06
  5. Step 5: Solve for x
    x = 1,247,657.06/1,290.20
  6. Step 6: Final answer
    x = 967.02

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1.5x scale

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.