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Finding the Fourth Proportional to 256,412.32, 384,664.95 and 128,395.36

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Solution

The fourth proportional to 256,412.32, 384,664.95 and 128,395.36 is: 192,616.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,412.32 : 384,664.95 = 128,395.36 : x
  2. Step 2: Convert to fraction form
    256,412.32/384,664.95 = 128,395.36/x
  3. Step 3: Cross multiply
    256,412.32x = 384,664.95 × 128,395.36
  4. Step 4: Simplify right side
    256,412.32x = 49,389,194,734.63
  5. Step 5: Solve for x
    x = 49,389,194,734.63/256,412.32
  6. Step 6: Final answer
    x = 192,616.31

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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.