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Finding the Fourth Proportional to 1,364.20, 1,881.74 and 860.09

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Solution

The fourth proportional to 1,364.20, 1,881.74 and 860.09 is: 1,186.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,364.20 : 1,881.74 = 860.09 : x
  2. Step 2: Convert to fraction form
    1,364.20/1,881.74 = 860.09/x
  3. Step 3: Cross multiply
    1,364.20x = 1,881.74 × 860.09
  4. Step 4: Simplify right side
    1,364.20x = 1,618,458.50
  5. Step 5: Solve for x
    x = 1,618,458.50/1,364.20
  6. Step 6: Final answer
    x = 1,186.38

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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.