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Finding the Fourth Proportional to 256,334.60, 384,530.70 and 78,840.20

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Solution

The fourth proportional to 256,334.60, 384,530.70 and 78,840.20 is: 118,269.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,334.60 : 384,530.70 = 78,840.20 : x
  2. Step 2: Convert to fraction form
    256,334.60/384,530.70 = 78,840.20/x
  3. Step 3: Cross multiply
    256,334.60x = 384,530.70 × 78,840.20
  4. Step 4: Simplify right side
    256,334.60x = 30,316,477,294.14
  5. Step 5: Solve for x
    x = 30,316,477,294.14/256,334.60
  6. Step 6: Final answer
    x = 118,269.16

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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.