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Finding the Fourth Proportional to 790.60, 1,089.93 and 495.67

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Solution

The fourth proportional to 790.60, 1,089.93 and 495.67 is: 683.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.60 : 1,089.93 = 495.67 : x
  2. Step 2: Convert to fraction form
    790.60/1,089.93 = 495.67/x
  3. Step 3: Cross multiply
    790.60x = 1,089.93 × 495.67
  4. Step 4: Simplify right side
    790.60x = 540,245.60
  5. Step 5: Solve for x
    x = 540,245.60/790.60
  6. Step 6: Final answer
    x = 683.34

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Double scale
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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.