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Finding the Fourth Proportional to 1,395.85, 1,926.53 and 836.20

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Solution

The fourth proportional to 1,395.85, 1,926.53 and 836.20 is: 1,154.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.85 : 1,926.53 = 836.20 : x
  2. Step 2: Convert to fraction form
    1,395.85/1,926.53 = 836.20/x
  3. Step 3: Cross multiply
    1,395.85x = 1,926.53 × 836.20
  4. Step 4: Simplify right side
    1,395.85x = 1,610,964.39
  5. Step 5: Solve for x
    x = 1,610,964.39/1,395.85
  6. Step 6: Final answer
    x = 1,154.11

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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.