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Finding the Fourth Proportional to 978,128.40, 1,467,192.60 and 409,411.20

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Solution

The fourth proportional to 978,128.40, 1,467,192.60 and 409,411.20 is: 614,116.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,128.40 : 1,467,192.60 = 409,411.20 : x
  2. Step 2: Convert to fraction form
    978,128.40/1,467,192.60 = 409,411.20/x
  3. Step 3: Cross multiply
    978,128.40x = 1,467,192.60 × 409,411.20
  4. Step 4: Simplify right side
    978,128.40x = 600,685,082,997.12
  5. Step 5: Solve for x
    x = 600,685,082,997.12/978,128.40
  6. Step 6: Final answer
    x = 614,116.80

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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.