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Finding the Fourth Proportional to 139,442.51, 192,431.88 and 75,780.30

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Solution

The fourth proportional to 139,442.51, 192,431.88 and 75,780.30 is: 104,577.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,442.51 : 192,431.88 = 75,780.30 : x
  2. Step 2: Convert to fraction form
    139,442.51/192,431.88 = 75,780.30/x
  3. Step 3: Cross multiply
    139,442.51x = 192,431.88 × 75,780.30
  4. Step 4: Simplify right side
    139,442.51x = 14,582,545,595.96
  5. Step 5: Solve for x
    x = 14,582,545,595.96/139,442.51
  6. Step 6: Final answer
    x = 104,577.47

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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.