Home / 1,159.72-1,738.80-429.20

Finding the Fourth Proportional to 1,159.72, 1,738.80 and 429.20

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Solution

The fourth proportional to 1,159.72, 1,738.80 and 429.20 is: 643.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159.72 : 1,738.80 = 429.20 : x
  2. Step 2: Convert to fraction form
    1,159.72/1,738.80 = 429.20/x
  3. Step 3: Cross multiply
    1,159.72x = 1,738.80 × 429.20
  4. Step 4: Simplify right side
    1,159.72x = 746,292.96
  5. Step 5: Solve for x
    x = 746,292.96/1,159.72
  6. Step 6: Final answer
    x = 643.51

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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.