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Finding the Fourth Proportional to 528,028.40, 790,660.20 and 387,023.60

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Solution

The fourth proportional to 528,028.40, 790,660.20 and 387,023.60 is: 579,522.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,028.40 : 790,660.20 = 387,023.60 : x
  2. Step 2: Convert to fraction form
    528,028.40/790,660.20 = 387,023.60/x
  3. Step 3: Cross multiply
    528,028.40x = 790,660.20 × 387,023.60
  4. Step 4: Simplify right side
    528,028.40x = 306,004,156,980.72
  5. Step 5: Solve for x
    x = 306,004,156,980.72/528,028.40
  6. Step 6: Final answer
    x = 579,522.16

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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.