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Finding the Fourth Proportional to 1,357.66, 1,872.84 and 860.12

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Solution

The fourth proportional to 1,357.66, 1,872.84 and 860.12 is: 1,186.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.66 : 1,872.84 = 860.12 : x
  2. Step 2: Convert to fraction form
    1,357.66/1,872.84 = 860.12/x
  3. Step 3: Cross multiply
    1,357.66x = 1,872.84 × 860.12
  4. Step 4: Simplify right side
    1,357.66x = 1,610,867.14
  5. Step 5: Solve for x
    x = 1,610,867.14/1,357.66
  6. Step 6: Final answer
    x = 1,186.50

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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.