Home / 1,381.49-1,904.40-1,008.89

Finding the Fourth Proportional to 1,381.49, 1,904.40 and 1,008.89

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Solution

The fourth proportional to 1,381.49, 1,904.40 and 1,008.89 is: 1,390.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.49 : 1,904.40 = 1,008.89 : x
  2. Step 2: Convert to fraction form
    1,381.49/1,904.40 = 1,008.89/x
  3. Step 3: Cross multiply
    1,381.49x = 1,904.40 × 1,008.89
  4. Step 4: Simplify right side
    1,381.49x = 1,921,330.12
  5. Step 5: Solve for x
    x = 1,921,330.12/1,381.49
  6. Step 6: Final answer
    x = 1,390.77

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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.