Home / 769,868.80-1,155,000.21-320,440.30

Finding the Fourth Proportional to 769,868.80, 1,155,000.21 and 320,440.30

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Solution

The fourth proportional to 769,868.80, 1,155,000.21 and 320,440.30 is: 480,742.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    769,868.80 : 1,155,000.21 = 320,440.30 : x
  2. Step 2: Convert to fraction form
    769,868.80/1,155,000.21 = 320,440.30/x
  3. Step 3: Cross multiply
    769,868.80x = 1,155,000.21 × 320,440.30
  4. Step 4: Simplify right side
    769,868.80x = 370,108,613,792.46
  5. Step 5: Solve for x
    x = 370,108,613,792.46/769,868.80
  6. Step 6: Final answer
    x = 480,742.45

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Double scale
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Similar ratio
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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.