Home / 208,123.69-287,015.78-138,149.24

Finding the Fourth Proportional to 208,123.69, 287,015.78 and 138,149.24

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Solution

The fourth proportional to 208,123.69, 287,015.78 and 138,149.24 is: 190,516.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,123.69 : 287,015.78 = 138,149.24 : x
  2. Step 2: Convert to fraction form
    208,123.69/287,015.78 = 138,149.24/x
  3. Step 3: Cross multiply
    208,123.69x = 287,015.78 × 138,149.24
  4. Step 4: Simplify right side
    208,123.69x = 39,651,010,812.09
  5. Step 5: Solve for x
    x = 39,651,010,812.09/208,123.69
  6. Step 6: Final answer
    x = 190,516.57

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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.