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Finding the Fourth Proportional to 1,176.10, 1,622.98 and 678.76

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Solution

The fourth proportional to 1,176.10, 1,622.98 and 678.76 is: 936.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,176.10 : 1,622.98 = 678.76 : x
  2. Step 2: Convert to fraction form
    1,176.10/1,622.98 = 678.76/x
  3. Step 3: Cross multiply
    1,176.10x = 1,622.98 × 678.76
  4. Step 4: Simplify right side
    1,176.10x = 1,101,613.90
  5. Step 5: Solve for x
    x = 1,101,613.90/1,176.10
  6. Step 6: Final answer
    x = 936.67

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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.