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Finding the Fourth Proportional to 1,366.78, 1,886.16 and 777.20

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Solution

The fourth proportional to 1,366.78, 1,886.16 and 777.20 is: 1,072.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,366.78 : 1,886.16 = 777.20 : x
  2. Step 2: Convert to fraction form
    1,366.78/1,886.16 = 777.20/x
  3. Step 3: Cross multiply
    1,366.78x = 1,886.16 × 777.20
  4. Step 4: Simplify right side
    1,366.78x = 1,465,923.55
  5. Step 5: Solve for x
    x = 1,465,923.55/1,366.78
  6. Step 6: Final answer
    x = 1,072.54

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1.5x scale

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.