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Finding the Fourth Proportional to 1,358.34, 1,874.75 and 860.64

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Solution

The fourth proportional to 1,358.34, 1,874.75 and 860.64 is: 1,187.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.34 : 1,874.75 = 860.64 : x
  2. Step 2: Convert to fraction form
    1,358.34/1,874.75 = 860.64/x
  3. Step 3: Cross multiply
    1,358.34x = 1,874.75 × 860.64
  4. Step 4: Simplify right side
    1,358.34x = 1,613,484.84
  5. Step 5: Solve for x
    x = 1,613,484.84/1,358.34
  6. Step 6: Final answer
    x = 1,187.84

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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.