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Finding the Fourth Proportional to 1,557.60, 2,149.48 and 858.96

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Solution

The fourth proportional to 1,557.60, 2,149.48 and 858.96 is: 1,185.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.60 : 2,149.48 = 858.96 : x
  2. Step 2: Convert to fraction form
    1,557.60/2,149.48 = 858.96/x
  3. Step 3: Cross multiply
    1,557.60x = 2,149.48 × 858.96
  4. Step 4: Simplify right side
    1,557.60x = 1,846,317.34
  5. Step 5: Solve for x
    x = 1,846,317.34/1,557.60
  6. Step 6: Final answer
    x = 1,185.36

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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.