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Finding the Fourth Proportional to 660,389.60, 990,251.76 and 323,455.52

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Solution

The fourth proportional to 660,389.60, 990,251.76 and 323,455.52 is: 485,020.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,389.60 : 990,251.76 = 323,455.52 : x
  2. Step 2: Convert to fraction form
    660,389.60/990,251.76 = 323,455.52/x
  3. Step 3: Cross multiply
    660,389.60x = 990,251.76 × 323,455.52
  4. Step 4: Simplify right side
    660,389.60x = 320,302,397,961.72
  5. Step 5: Solve for x
    x = 320,302,397,961.72/660,389.60
  6. Step 6: Final answer
    x = 485,020.35

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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.