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Finding the Fourth Proportional to 1,858.78, 2,564 and 1,195.40

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Solution

The fourth proportional to 1,858.78, 2,564 and 1,195.40 is: 1,648.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.78 : 2,564 = 1,195.40 : x
  2. Step 2: Convert to fraction form
    1,858.78/2,564 = 1,195.40/x
  3. Step 3: Cross multiply
    1,858.78x = 2,564 × 1,195.40
  4. Step 4: Simplify right side
    1,858.78x = 3,065,005.60
  5. Step 5: Solve for x
    x = 3,065,005.60/1,858.78
  6. Step 6: Final answer
    x = 1,648.93

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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.