Home / 815,428.80-1,223,143.20-254,390.40

Finding the Fourth Proportional to 815,428.80, 1,223,143.20 and 254,390.40

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Solution

The fourth proportional to 815,428.80, 1,223,143.20 and 254,390.40 is: 381,585.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,428.80 : 1,223,143.20 = 254,390.40 : x
  2. Step 2: Convert to fraction form
    815,428.80/1,223,143.20 = 254,390.40/x
  3. Step 3: Cross multiply
    815,428.80x = 1,223,143.20 × 254,390.40
  4. Step 4: Simplify right side
    815,428.80x = 311,155,887,905.28
  5. Step 5: Solve for x
    x = 311,155,887,905.28/815,428.80
  6. Step 6: Final answer
    x = 381,585.60

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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.