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Finding the Fourth Proportional to 139,928.51, 209,913.53 and 45,127.53

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Solution

The fourth proportional to 139,928.51, 209,913.53 and 45,127.53 is: 67,697.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,928.51 : 209,913.53 = 45,127.53 : x
  2. Step 2: Convert to fraction form
    139,928.51/209,913.53 = 45,127.53/x
  3. Step 3: Cross multiply
    139,928.51x = 209,913.53 × 45,127.53
  4. Step 4: Simplify right side
    139,928.51x = 9,472,878,896.84
  5. Step 5: Solve for x
    x = 9,472,878,896.84/139,928.51
  6. Step 6: Final answer
    x = 67,697.99

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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.