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Finding the Fourth Proportional to 1,390.09, 1,919.07 and 886.45

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Solution

The fourth proportional to 1,390.09, 1,919.07 and 886.45 is: 1,223.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.09 : 1,919.07 = 886.45 : x
  2. Step 2: Convert to fraction form
    1,390.09/1,919.07 = 886.45/x
  3. Step 3: Cross multiply
    1,390.09x = 1,919.07 × 886.45
  4. Step 4: Simplify right side
    1,390.09x = 1,701,159.60
  5. Step 5: Solve for x
    x = 1,701,159.60/1,390.09
  6. Step 6: Final answer
    x = 1,223.78

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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.