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Finding the Fourth Proportional to 1,214.02, 1,674.40 and 815.55

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Solution

The fourth proportional to 1,214.02, 1,674.40 and 815.55 is: 1,124.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.02 : 1,674.40 = 815.55 : x
  2. Step 2: Convert to fraction form
    1,214.02/1,674.40 = 815.55/x
  3. Step 3: Cross multiply
    1,214.02x = 1,674.40 × 815.55
  4. Step 4: Simplify right side
    1,214.02x = 1,365,556.92
  5. Step 5: Solve for x
    x = 1,365,556.92/1,214.02
  6. Step 6: Final answer
    x = 1,124.82

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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.