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Finding the Fourth Proportional to 615,916.20, 923,355.90 and 320,428.20

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Solution

The fourth proportional to 615,916.20, 923,355.90 and 320,428.20 is: 480,372.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,916.20 : 923,355.90 = 320,428.20 : x
  2. Step 2: Convert to fraction form
    615,916.20/923,355.90 = 320,428.20/x
  3. Step 3: Cross multiply
    615,916.20x = 923,355.90 × 320,428.20
  4. Step 4: Simplify right side
    615,916.20x = 295,869,268,996.38
  5. Step 5: Solve for x
    x = 295,869,268,996.38/615,916.20
  6. Step 6: Final answer
    x = 480,372.60

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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.