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Finding the Fourth Proportional to 256,465.40, 384,390.90 and 131,742.20

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Solution

The fourth proportional to 256,465.40, 384,390.90 and 131,742.20 is: 197,455.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,465.40 : 384,390.90 = 131,742.20 : x
  2. Step 2: Convert to fraction form
    256,465.40/384,390.90 = 131,742.20/x
  3. Step 3: Cross multiply
    256,465.40x = 384,390.90 × 131,742.20
  4. Step 4: Simplify right side
    256,465.40x = 50,640,502,825.98
  5. Step 5: Solve for x
    x = 50,640,502,825.98/256,465.40
  6. Step 6: Final answer
    x = 197,455.50

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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.