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Finding the Fourth Proportional to 1,390.33, 1,919.66 and 859.94

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Solution

The fourth proportional to 1,390.33, 1,919.66 and 859.94 is: 1,187.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.33 : 1,919.66 = 859.94 : x
  2. Step 2: Convert to fraction form
    1,390.33/1,919.66 = 859.94/x
  3. Step 3: Cross multiply
    1,390.33x = 1,919.66 × 859.94
  4. Step 4: Simplify right side
    1,390.33x = 1,650,792.42
  5. Step 5: Solve for x
    x = 1,650,792.42/1,390.33
  6. Step 6: Final answer
    x = 1,187.34

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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.