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Finding the Fourth Proportional to 645,270.70, 890,483.75 and 354,894.88

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Solution

The fourth proportional to 645,270.70, 890,483.75 and 354,894.88 is: 489,760.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,270.70 : 890,483.75 = 354,894.88 : x
  2. Step 2: Convert to fraction form
    645,270.70/890,483.75 = 354,894.88/x
  3. Step 3: Cross multiply
    645,270.70x = 890,483.75 × 354,894.88
  4. Step 4: Simplify right side
    645,270.70x = 316,028,123,598.20
  5. Step 5: Solve for x
    x = 316,028,123,598.20/645,270.70
  6. Step 6: Final answer
    x = 489,760.54

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1.5x scale

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.