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Finding the Fourth Proportional to 85,321, 117,728.40 and 49,502.80

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Solution

The fourth proportional to 85,321, 117,728.40 and 49,502.80 is: 68,305.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,321 : 117,728.40 = 49,502.80 : x
  2. Step 2: Convert to fraction form
    85,321/117,728.40 = 49,502.80/x
  3. Step 3: Cross multiply
    85,321x = 117,728.40 × 49,502.80
  4. Step 4: Simplify right side
    85,321x = 5,827,885,439.52
  5. Step 5: Solve for x
    x = 5,827,885,439.52/85,321
  6. Step 6: Final answer
    x = 68,305.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.