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Finding the Fourth Proportional to 1,557.35, 2,149.16 and 858.72

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Solution

The fourth proportional to 1,557.35, 2,149.16 and 858.72 is: 1,185.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.35 : 2,149.16 = 858.72 : x
  2. Step 2: Convert to fraction form
    1,557.35/2,149.16 = 858.72/x
  3. Step 3: Cross multiply
    1,557.35x = 2,149.16 × 858.72
  4. Step 4: Simplify right side
    1,557.35x = 1,845,522.38
  5. Step 5: Solve for x
    x = 1,845,522.38/1,557.35
  6. Step 6: Final answer
    x = 1,185.04

Related Problems

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Half scale
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Double scale
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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.