Home / 645,738.80-891,119.56-359,258.80

Finding the Fourth Proportional to 645,738.80, 891,119.56 and 359,258.80

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Solution

The fourth proportional to 645,738.80, 891,119.56 and 359,258.80 is: 495,777.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,738.80 : 891,119.56 = 359,258.80 : x
  2. Step 2: Convert to fraction form
    645,738.80/891,119.56 = 359,258.80/x
  3. Step 3: Cross multiply
    645,738.80x = 891,119.56 × 359,258.80
  4. Step 4: Simplify right side
    645,738.80x = 320,142,543,782.13
  5. Step 5: Solve for x
    x = 320,142,543,782.13/645,738.80
  6. Step 6: Final answer
    x = 495,777.15

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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.