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Finding the Fourth Proportional to 440,266.40, 659,816.40 and 390,111.20

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Solution

The fourth proportional to 440,266.40, 659,816.40 and 390,111.20 is: 584,650.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    440,266.40 : 659,816.40 = 390,111.20 : x
  2. Step 2: Convert to fraction form
    440,266.40/659,816.40 = 390,111.20/x
  3. Step 3: Cross multiply
    440,266.40x = 659,816.40 × 390,111.20
  4. Step 4: Simplify right side
    440,266.40x = 257,401,767,583.68
  5. Step 5: Solve for x
    x = 257,401,767,583.68/440,266.40
  6. Step 6: Final answer
    x = 584,650.04

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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.