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Finding the Fourth Proportional to 1,587.40, 2,381.10 and 858.40

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Solution

The fourth proportional to 1,587.40, 2,381.10 and 858.40 is: 1,287.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.40 : 2,381.10 = 858.40 : x
  2. Step 2: Convert to fraction form
    1,587.40/2,381.10 = 858.40/x
  3. Step 3: Cross multiply
    1,587.40x = 2,381.10 × 858.40
  4. Step 4: Simplify right side
    1,587.40x = 2,043,936.24
  5. Step 5: Solve for x
    x = 2,043,936.24/1,587.40
  6. Step 6: Final answer
    x = 1,287.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.