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Finding the Fourth Proportional to 615,813.80, 923,720.70 and 378,386.60

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Solution

The fourth proportional to 615,813.80, 923,720.70 and 378,386.60 is: 567,579.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,813.80 : 923,720.70 = 378,386.60 : x
  2. Step 2: Convert to fraction form
    615,813.80/923,720.70 = 378,386.60/x
  3. Step 3: Cross multiply
    615,813.80x = 923,720.70 × 378,386.60
  4. Step 4: Simplify right side
    615,813.80x = 349,523,535,022.62
  5. Step 5: Solve for x
    x = 349,523,535,022.62/615,813.80
  6. Step 6: Final answer
    x = 567,579.90

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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.