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Finding the Fourth Proportional to 1,557.65, 2,149.56 and 859.02

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Solution

The fourth proportional to 1,557.65, 2,149.56 and 859.02 is: 1,185.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.65 : 2,149.56 = 859.02 : x
  2. Step 2: Convert to fraction form
    1,557.65/2,149.56 = 859.02/x
  3. Step 3: Cross multiply
    1,557.65x = 2,149.56 × 859.02
  4. Step 4: Simplify right side
    1,557.65x = 1,846,515.03
  5. Step 5: Solve for x
    x = 1,846,515.03/1,557.65
  6. Step 6: Final answer
    x = 1,185.45

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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.