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Finding the Fourth Proportional to 1,557, 2,148.66 and 858.44

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Solution

The fourth proportional to 1,557, 2,148.66 and 858.44 is: 1,184.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557 : 2,148.66 = 858.44 : x
  2. Step 2: Convert to fraction form
    1,557/2,148.66 = 858.44/x
  3. Step 3: Cross multiply
    1,557x = 2,148.66 × 858.44
  4. Step 4: Simplify right side
    1,557x = 1,844,495.69
  5. Step 5: Solve for x
    x = 1,844,495.69/1,557
  6. Step 6: Final answer
    x = 1,184.65

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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.