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Finding the Fourth Proportional to 1,381.09, 1,905.13 and 909.06

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Solution

The fourth proportional to 1,381.09, 1,905.13 and 909.06 is: 1,253.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.09 : 1,905.13 = 909.06 : x
  2. Step 2: Convert to fraction form
    1,381.09/1,905.13 = 909.06/x
  3. Step 3: Cross multiply
    1,381.09x = 1,905.13 × 909.06
  4. Step 4: Simplify right side
    1,381.09x = 1,731,877.48
  5. Step 5: Solve for x
    x = 1,731,877.48/1,381.09
  6. Step 6: Final answer
    x = 1,253.99

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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.