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Finding the Fourth Proportional to 1,585.40, 2,378.10 and 1,393.40

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Solution

The fourth proportional to 1,585.40, 2,378.10 and 1,393.40 is: 2,090.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.40 : 2,378.10 = 1,393.40 : x
  2. Step 2: Convert to fraction form
    1,585.40/2,378.10 = 1,393.40/x
  3. Step 3: Cross multiply
    1,585.40x = 2,378.10 × 1,393.40
  4. Step 4: Simplify right side
    1,585.40x = 3,313,644.54
  5. Step 5: Solve for x
    x = 3,313,644.54/1,585.40
  6. Step 6: Final answer
    x = 2,090.10

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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.