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Finding the Fourth Proportional to 1,278.71, 1,918.06 and 866.82

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Solution

The fourth proportional to 1,278.71, 1,918.06 and 866.82 is: 1,300.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.71 : 1,918.06 = 866.82 : x
  2. Step 2: Convert to fraction form
    1,278.71/1,918.06 = 866.82/x
  3. Step 3: Cross multiply
    1,278.71x = 1,918.06 × 866.82
  4. Step 4: Simplify right side
    1,278.71x = 1,662,621.05
  5. Step 5: Solve for x
    x = 1,662,621.05/1,278.71
  6. Step 6: Final answer
    x = 1,300.23

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1.5x scale

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.