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Finding the Fourth Proportional to 1,857.40, 2,785.43 and 870.04

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Solution

The fourth proportional to 1,857.40, 2,785.43 and 870.04 is: 1,304.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.40 : 2,785.43 = 870.04 : x
  2. Step 2: Convert to fraction form
    1,857.40/2,785.43 = 870.04/x
  3. Step 3: Cross multiply
    1,857.40x = 2,785.43 × 870.04
  4. Step 4: Simplify right side
    1,857.40x = 2,423,442.15
  5. Step 5: Solve for x
    x = 2,423,442.15/1,857.40
  6. Step 6: Final answer
    x = 1,304.75

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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.