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Finding the Fourth Proportional to 427,490.40, 640,911.60 and 217,279.20

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Solution

The fourth proportional to 427,490.40, 640,911.60 and 217,279.20 is: 325,754.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,490.40 : 640,911.60 = 217,279.20 : x
  2. Step 2: Convert to fraction form
    427,490.40/640,911.60 = 217,279.20/x
  3. Step 3: Cross multiply
    427,490.40x = 640,911.60 × 217,279.20
  4. Step 4: Simplify right side
    427,490.40x = 139,256,759,718.72
  5. Step 5: Solve for x
    x = 139,256,759,718.72/427,490.40
  6. Step 6: Final answer
    x = 325,754.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.