Home / 645,144.65-890,356.34-354,807.37

Finding the Fourth Proportional to 645,144.65, 890,356.34 and 354,807.37

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Solution

The fourth proportional to 645,144.65, 890,356.34 and 354,807.37 is: 489,665.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,144.65 : 890,356.34 = 354,807.37 : x
  2. Step 2: Convert to fraction form
    645,144.65/890,356.34 = 354,807.37/x
  3. Step 3: Cross multiply
    645,144.65x = 890,356.34 × 354,807.37
  4. Step 4: Simplify right side
    645,144.65x = 315,904,991,358.23
  5. Step 5: Solve for x
    x = 315,904,991,358.23/645,144.65
  6. Step 6: Final answer
    x = 489,665.37

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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.