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Finding the Fourth Proportional to 61,815.28, 85,268.54 and 39,459.28

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Solution

The fourth proportional to 61,815.28, 85,268.54 and 39,459.28 is: 54,430.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,815.28 : 85,268.54 = 39,459.28 : x
  2. Step 2: Convert to fraction form
    61,815.28/85,268.54 = 39,459.28/x
  3. Step 3: Cross multiply
    61,815.28x = 85,268.54 × 39,459.28
  4. Step 4: Simplify right side
    61,815.28x = 3,364,635,195.05
  5. Step 5: Solve for x
    x = 3,364,635,195.05/61,815.28
  6. Step 6: Final answer
    x = 54,430.48

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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.