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Finding the Fourth Proportional to 1,391.65, 2,087.76 and 569.99

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Solution

The fourth proportional to 1,391.65, 2,087.76 and 569.99 is: 855.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.65 : 2,087.76 = 569.99 : x
  2. Step 2: Convert to fraction form
    1,391.65/2,087.76 = 569.99/x
  3. Step 3: Cross multiply
    1,391.65x = 2,087.76 × 569.99
  4. Step 4: Simplify right side
    1,391.65x = 1,190,002.32
  5. Step 5: Solve for x
    x = 1,190,002.32/1,391.65
  6. Step 6: Final answer
    x = 855.10

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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.