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Finding the Fourth Proportional to 61,917.40, 85,459.62 and 40,698.64

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Solution

The fourth proportional to 61,917.40, 85,459.62 and 40,698.64 is: 56,173.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,917.40 : 85,459.62 = 40,698.64 : x
  2. Step 2: Convert to fraction form
    61,917.40/85,459.62 = 40,698.64/x
  3. Step 3: Cross multiply
    61,917.40x = 85,459.62 × 40,698.64
  4. Step 4: Simplify right side
    61,917.40x = 3,478,090,308.92
  5. Step 5: Solve for x
    x = 3,478,090,308.92/61,917.40
  6. Step 6: Final answer
    x = 56,173.07

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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.