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Finding the Fourth Proportional to 256,403.07, 384,651.08 and 128,386.11

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Solution

The fourth proportional to 256,403.07, 384,651.08 and 128,386.11 is: 192,602.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,403.07 : 384,651.08 = 128,386.11 : x
  2. Step 2: Convert to fraction form
    256,403.07/384,651.08 = 128,386.11/x
  3. Step 3: Cross multiply
    256,403.07x = 384,651.08 × 128,386.11
  4. Step 4: Simplify right side
    256,403.07x = 49,383,857,150.46
  5. Step 5: Solve for x
    x = 49,383,857,150.46/256,403.07
  6. Step 6: Final answer
    x = 192,602.44

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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.