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Finding the Fourth Proportional to 839.79, 1,155.51 and 818.33

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Solution

The fourth proportional to 839.79, 1,155.51 and 818.33 is: 1,125.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.79 : 1,155.51 = 818.33 : x
  2. Step 2: Convert to fraction form
    839.79/1,155.51 = 818.33/x
  3. Step 3: Cross multiply
    839.79x = 1,155.51 × 818.33
  4. Step 4: Simplify right side
    839.79x = 945,582.72
  5. Step 5: Solve for x
    x = 945,582.72/839.79
  6. Step 6: Final answer
    x = 1,125.98

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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.