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Finding the Fourth Proportional to 645,427.61, 890,662.62 and 355,020.74

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Solution

The fourth proportional to 645,427.61, 890,662.62 and 355,020.74 is: 489,913.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,427.61 : 890,662.62 = 355,020.74 : x
  2. Step 2: Convert to fraction form
    645,427.61/890,662.62 = 355,020.74/x
  3. Step 3: Cross multiply
    645,427.61x = 890,662.62 × 355,020.74
  4. Step 4: Simplify right side
    645,427.61x = 316,203,702,442.74
  5. Step 5: Solve for x
    x = 316,203,702,442.74/645,427.61
  6. Step 6: Final answer
    x = 489,913.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.