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Finding the Fourth Proportional to 128,038.80, 192,051.80 and 65,715.60

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Solution

The fourth proportional to 128,038.80, 192,051.80 and 65,715.60 is: 98,570.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,038.80 : 192,051.80 = 65,715.60 : x
  2. Step 2: Convert to fraction form
    128,038.80/192,051.80 = 65,715.60/x
  3. Step 3: Cross multiply
    128,038.80x = 192,051.80 × 65,715.60
  4. Step 4: Simplify right side
    128,038.80x = 12,620,799,268.08
  5. Step 5: Solve for x
    x = 12,620,799,268.08/128,038.80
  6. Step 6: Final answer
    x = 98,570.12

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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.