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Finding the Fourth Proportional to 1,290.07, 1,780.34 and 758.99

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Solution

The fourth proportional to 1,290.07, 1,780.34 and 758.99 is: 1,047.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.07 : 1,780.34 = 758.99 : x
  2. Step 2: Convert to fraction form
    1,290.07/1,780.34 = 758.99/x
  3. Step 3: Cross multiply
    1,290.07x = 1,780.34 × 758.99
  4. Step 4: Simplify right side
    1,290.07x = 1,351,254.24
  5. Step 5: Solve for x
    x = 1,351,254.24/1,290.07
  6. Step 6: Final answer
    x = 1,047.43

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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.