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Finding the Fourth Proportional to 139,802.36, 192,921.28 and 76,140.32

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Solution

The fourth proportional to 139,802.36, 192,921.28 and 76,140.32 is: 105,070.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,802.36 : 192,921.28 = 76,140.32 : x
  2. Step 2: Convert to fraction form
    139,802.36/192,921.28 = 76,140.32/x
  3. Step 3: Cross multiply
    139,802.36x = 192,921.28 × 76,140.32
  4. Step 4: Simplify right side
    139,802.36x = 14,689,087,994.01
  5. Step 5: Solve for x
    x = 14,689,087,994.01/139,802.36
  6. Step 6: Final answer
    x = 105,070.39

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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.