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Finding the Fourth Proportional to 1,387.18, 1,914.23 and 828.28

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Solution

The fourth proportional to 1,387.18, 1,914.23 and 828.28 is: 1,142.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.18 : 1,914.23 = 828.28 : x
  2. Step 2: Convert to fraction form
    1,387.18/1,914.23 = 828.28/x
  3. Step 3: Cross multiply
    1,387.18x = 1,914.23 × 828.28
  4. Step 4: Simplify right side
    1,387.18x = 1,585,518.42
  5. Step 5: Solve for x
    x = 1,585,518.42/1,387.18
  6. Step 6: Final answer
    x = 1,142.98

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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.