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Finding the Fourth Proportional to 645,342.32, 890,433.24 and 390,704.24

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Solution

The fourth proportional to 645,342.32, 890,433.24 and 390,704.24 is: 539,087.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,342.32 : 890,433.24 = 390,704.24 : x
  2. Step 2: Convert to fraction form
    645,342.32/890,433.24 = 390,704.24/x
  3. Step 3: Cross multiply
    645,342.32x = 890,433.24 × 390,704.24
  4. Step 4: Simplify right side
    645,342.32x = 347,896,042,304.94
  5. Step 5: Solve for x
    x = 347,896,042,304.94/645,342.32
  6. Step 6: Final answer
    x = 539,087.60

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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.