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Finding the Fourth Proportional to 1,557.45, 2,149.28 and 858.82

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Solution

The fourth proportional to 1,557.45, 2,149.28 and 858.82 is: 1,185.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.45 : 2,149.28 = 858.82 : x
  2. Step 2: Convert to fraction form
    1,557.45/2,149.28 = 858.82/x
  3. Step 3: Cross multiply
    1,557.45x = 2,149.28 × 858.82
  4. Step 4: Simplify right side
    1,557.45x = 1,845,844.65
  5. Step 5: Solve for x
    x = 1,845,844.65/1,557.45
  6. Step 6: Final answer
    x = 1,185.17

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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.