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Finding the Fourth Proportional to 645,454.75, 890,722.62 and 355,060.07

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Solution

The fourth proportional to 645,454.75, 890,722.62 and 355,060.07 is: 489,980.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,454.75 : 890,722.62 = 355,060.07 : x
  2. Step 2: Convert to fraction form
    645,454.75/890,722.62 = 355,060.07/x
  3. Step 3: Cross multiply
    645,454.75x = 890,722.62 × 355,060.07
  4. Step 4: Simplify right side
    645,454.75x = 316,260,031,354.17
  5. Step 5: Solve for x
    x = 316,260,031,354.17/645,454.75
  6. Step 6: Final answer
    x = 489,980.18

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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.