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Finding the Fourth Proportional to 645,458.88, 890,728.31 and 355,064.18

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Solution

The fourth proportional to 645,458.88, 890,728.31 and 355,064.18 is: 489,985.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,458.88 : 890,728.31 = 355,064.18 : x
  2. Step 2: Convert to fraction form
    645,458.88/890,728.31 = 355,064.18/x
  3. Step 3: Cross multiply
    645,458.88x = 890,728.31 × 355,064.18
  4. Step 4: Simplify right side
    645,458.88x = 316,265,720,107.42
  5. Step 5: Solve for x
    x = 316,265,720,107.42/645,458.88
  6. Step 6: Final answer
    x = 489,985.85

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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.