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Finding the Fourth Proportional to 605,615.30, 907,438.80 and 520,978.40

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Solution

The fourth proportional to 605,615.30, 907,438.80 and 520,978.40 is: 780,620.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    605,615.30 : 907,438.80 = 520,978.40 : x
  2. Step 2: Convert to fraction form
    605,615.30/907,438.80 = 520,978.40/x
  3. Step 3: Cross multiply
    605,615.30x = 907,438.80 × 520,978.40
  4. Step 4: Simplify right side
    605,615.30x = 472,756,014,121.92
  5. Step 5: Solve for x
    x = 472,756,014,121.92/605,615.30
  6. Step 6: Final answer
    x = 780,620.99

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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.