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Finding the Fourth Proportional to 1,123.41, 1,685.32 and 343.40

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Solution

The fourth proportional to 1,123.41, 1,685.32 and 343.40 is: 515.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.41 : 1,685.32 = 343.40 : x
  2. Step 2: Convert to fraction form
    1,123.41/1,685.32 = 343.40/x
  3. Step 3: Cross multiply
    1,123.41x = 1,685.32 × 343.40
  4. Step 4: Simplify right side
    1,123.41x = 578,736.60
  5. Step 5: Solve for x
    x = 578,736.60/1,123.41
  6. Step 6: Final answer
    x = 515.16

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1.5x scale

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.