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Finding the Fourth Proportional to 85,854.72, 118,478.40 and 48,128.64

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Solution

The fourth proportional to 85,854.72, 118,478.40 and 48,128.64 is: 66,416.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,854.72 : 118,478.40 = 48,128.64 : x
  2. Step 2: Convert to fraction form
    85,854.72/118,478.40 = 48,128.64/x
  3. Step 3: Cross multiply
    85,854.72x = 118,478.40 × 48,128.64
  4. Step 4: Simplify right side
    85,854.72x = 5,702,204,261.38
  5. Step 5: Solve for x
    x = 5,702,204,261.38/85,854.72
  6. Step 6: Final answer
    x = 66,416.90

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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.