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Finding the Fourth Proportional to 409,270.40, 613,905.60 and 390,899.60

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Solution

The fourth proportional to 409,270.40, 613,905.60 and 390,899.60 is: 586,349.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,270.40 : 613,905.60 = 390,899.60 : x
  2. Step 2: Convert to fraction form
    409,270.40/613,905.60 = 390,899.60/x
  3. Step 3: Cross multiply
    409,270.40x = 613,905.60 × 390,899.60
  4. Step 4: Simplify right side
    409,270.40x = 239,975,453,477.76
  5. Step 5: Solve for x
    x = 239,975,453,477.76/409,270.40
  6. Step 6: Final answer
    x = 586,349.40

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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.