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Finding the Fourth Proportional to 1,689.86, 2,329.34 and 1,191.71

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Solution

The fourth proportional to 1,689.86, 2,329.34 and 1,191.71 is: 1,642.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.86 : 2,329.34 = 1,191.71 : x
  2. Step 2: Convert to fraction form
    1,689.86/2,329.34 = 1,191.71/x
  3. Step 3: Cross multiply
    1,689.86x = 2,329.34 × 1,191.71
  4. Step 4: Simplify right side
    1,689.86x = 2,775,880.17
  5. Step 5: Solve for x
    x = 2,775,880.17/1,689.86
  6. Step 6: Final answer
    x = 1,642.67

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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.