Home / 1,087.58-1,631.86-429.66

Finding the Fourth Proportional to 1,087.58, 1,631.86 and 429.66

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Solution

The fourth proportional to 1,087.58, 1,631.86 and 429.66 is: 644.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.58 : 1,631.86 = 429.66 : x
  2. Step 2: Convert to fraction form
    1,087.58/1,631.86 = 429.66/x
  3. Step 3: Cross multiply
    1,087.58x = 1,631.86 × 429.66
  4. Step 4: Simplify right side
    1,087.58x = 701,143.89
  5. Step 5: Solve for x
    x = 701,143.89/1,087.58
  6. Step 6: Final answer
    x = 644.68

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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.