Home / 1,378.12-2,066.55-555.70

Finding the Fourth Proportional to 1,378.12, 2,066.55 and 555.70

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Solution

The fourth proportional to 1,378.12, 2,066.55 and 555.70 is: 833.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.12 : 2,066.55 = 555.70 : x
  2. Step 2: Convert to fraction form
    1,378.12/2,066.55 = 555.70/x
  3. Step 3: Cross multiply
    1,378.12x = 2,066.55 × 555.70
  4. Step 4: Simplify right side
    1,378.12x = 1,148,381.84
  5. Step 5: Solve for x
    x = 1,148,381.84/1,378.12
  6. Step 6: Final answer
    x = 833.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.