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Finding the Fourth Proportional to 65,661.20, 98,492.60 and 21,287.60

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Solution

The fourth proportional to 65,661.20, 98,492.60 and 21,287.60 is: 31,931.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,661.20 : 98,492.60 = 21,287.60 : x
  2. Step 2: Convert to fraction form
    65,661.20/98,492.60 = 21,287.60/x
  3. Step 3: Cross multiply
    65,661.20x = 98,492.60 × 21,287.60
  4. Step 4: Simplify right side
    65,661.20x = 2,096,671,071.76
  5. Step 5: Solve for x
    x = 2,096,671,071.76/65,661.20
  6. Step 6: Final answer
    x = 31,931.66

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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.