Home / 138,139.07-190,631.64-77,709.76

Finding the Fourth Proportional to 138,139.07, 190,631.64 and 77,709.76

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Solution

The fourth proportional to 138,139.07, 190,631.64 and 77,709.76 is: 107,239.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,139.07 : 190,631.64 = 77,709.76 : x
  2. Step 2: Convert to fraction form
    138,139.07/190,631.64 = 77,709.76/x
  3. Step 3: Cross multiply
    138,139.07x = 190,631.64 × 77,709.76
  4. Step 4: Simplify right side
    138,139.07x = 14,813,938,516.23
  5. Step 5: Solve for x
    x = 14,813,938,516.23/138,139.07
  6. Step 6: Final answer
    x = 107,239.31

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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.