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Finding the Fourth Proportional to 85,618.78, 118,266.88 and 65,721.54

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Solution

The fourth proportional to 85,618.78, 118,266.88 and 65,721.54 is: 90,782.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,618.78 : 118,266.88 = 65,721.54 : x
  2. Step 2: Convert to fraction form
    85,618.78/118,266.88 = 65,721.54/x
  3. Step 3: Cross multiply
    85,618.78x = 118,266.88 × 65,721.54
  4. Step 4: Simplify right side
    85,618.78x = 7,772,681,484.60
  5. Step 5: Solve for x
    x = 7,772,681,484.60/85,618.78
  6. Step 6: Final answer
    x = 90,782.44

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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.