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Finding the Fourth Proportional to 65,989.78, 98,999.70 and 21,615.55

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Solution

The fourth proportional to 65,989.78, 98,999.70 and 21,615.55 is: 32,428.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,989.78 : 98,999.70 = 21,615.55 : x
  2. Step 2: Convert to fraction form
    65,989.78/98,999.70 = 21,615.55/x
  3. Step 3: Cross multiply
    65,989.78x = 98,999.70 × 21,615.55
  4. Step 4: Simplify right side
    65,989.78x = 2,139,932,965.34
  5. Step 5: Solve for x
    x = 2,139,932,965.34/65,989.78
  6. Step 6: Final answer
    x = 32,428.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.