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Finding the Fourth Proportional to 398,915.10, 550,491.90 and 217,626.98

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Solution

The fourth proportional to 398,915.10, 550,491.90 and 217,626.98 is: 300,319.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,915.10 : 550,491.90 = 217,626.98 : x
  2. Step 2: Convert to fraction form
    398,915.10/550,491.90 = 217,626.98/x
  3. Step 3: Cross multiply
    398,915.10x = 550,491.90 × 217,626.98
  4. Step 4: Simplify right side
    398,915.10x = 119,801,886,959.00
  5. Step 5: Solve for x
    x = 119,801,886,959.00/398,915.10
  6. Step 6: Final answer
    x = 300,319.26

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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.