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Finding the Fourth Proportional to 645,273.30, 890,471.60 and 358,790.88

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Solution

The fourth proportional to 645,273.30, 890,471.60 and 358,790.88 is: 495,128.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,273.30 : 890,471.60 = 358,790.88 : x
  2. Step 2: Convert to fraction form
    645,273.30/890,471.60 = 358,790.88/x
  3. Step 3: Cross multiply
    645,273.30x = 890,471.60 × 358,790.88
  4. Step 4: Simplify right side
    645,273.30x = 319,493,088,979.01
  5. Step 5: Solve for x
    x = 319,493,088,979.01/645,273.30
  6. Step 6: Final answer
    x = 495,128.33

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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.