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Finding the Fourth Proportional to 1,260.10, 1,886.55 and 774.10

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Solution

The fourth proportional to 1,260.10, 1,886.55 and 774.10 is: 1,158.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.10 : 1,886.55 = 774.10 : x
  2. Step 2: Convert to fraction form
    1,260.10/1,886.55 = 774.10/x
  3. Step 3: Cross multiply
    1,260.10x = 1,886.55 × 774.10
  4. Step 4: Simplify right side
    1,260.10x = 1,460,378.36
  5. Step 5: Solve for x
    x = 1,460,378.36/1,260.10
  6. Step 6: Final answer
    x = 1,158.94

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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.