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Finding the Fourth Proportional to 1,189.65, 1,642.15 and 894.40

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Solution

The fourth proportional to 1,189.65, 1,642.15 and 894.40 is: 1,234.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.65 : 1,642.15 = 894.40 : x
  2. Step 2: Convert to fraction form
    1,189.65/1,642.15 = 894.40/x
  3. Step 3: Cross multiply
    1,189.65x = 1,642.15 × 894.40
  4. Step 4: Simplify right side
    1,189.65x = 1,468,738.96
  5. Step 5: Solve for x
    x = 1,468,738.96/1,189.65
  6. Step 6: Final answer
    x = 1,234.60

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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.