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Finding the Fourth Proportional to 912.90, 1,369.33 and 619.67

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Solution

The fourth proportional to 912.90, 1,369.33 and 619.67 is: 929.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.90 : 1,369.33 = 619.67 : x
  2. Step 2: Convert to fraction form
    912.90/1,369.33 = 619.67/x
  3. Step 3: Cross multiply
    912.90x = 1,369.33 × 619.67
  4. Step 4: Simplify right side
    912.90x = 848,532.72
  5. Step 5: Solve for x
    x = 848,532.72/912.90
  6. Step 6: Final answer
    x = 929.50

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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.