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Finding the Fourth Proportional to 139,071.54, 191,918.88 and 75,409.50

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Solution

The fourth proportional to 139,071.54, 191,918.88 and 75,409.50 is: 104,065.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,071.54 : 191,918.88 = 75,409.50 : x
  2. Step 2: Convert to fraction form
    139,071.54/191,918.88 = 75,409.50/x
  3. Step 3: Cross multiply
    139,071.54x = 191,918.88 × 75,409.50
  4. Step 4: Simplify right side
    139,071.54x = 14,472,506,781.36
  5. Step 5: Solve for x
    x = 14,472,506,781.36/139,071.54
  6. Step 6: Final answer
    x = 104,065.19

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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.