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Finding the Fourth Proportional to 1,378.42, 1,902.80 and 880.94

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Solution

The fourth proportional to 1,378.42, 1,902.80 and 880.94 is: 1,216.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.42 : 1,902.80 = 880.94 : x
  2. Step 2: Convert to fraction form
    1,378.42/1,902.80 = 880.94/x
  3. Step 3: Cross multiply
    1,378.42x = 1,902.80 × 880.94
  4. Step 4: Simplify right side
    1,378.42x = 1,676,259.59
  5. Step 5: Solve for x
    x = 1,676,259.59/1,378.42
  6. Step 6: Final answer
    x = 1,216.08

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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.