Home / 100,109.67-138,151.23-56,511.39

Finding the Fourth Proportional to 100,109.67, 138,151.23 and 56,511.39

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Solution

The fourth proportional to 100,109.67, 138,151.23 and 56,511.39 is: 77,985.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,109.67 : 138,151.23 = 56,511.39 : x
  2. Step 2: Convert to fraction form
    100,109.67/138,151.23 = 56,511.39/x
  3. Step 3: Cross multiply
    100,109.67x = 138,151.23 × 56,511.39
  4. Step 4: Simplify right side
    100,109.67x = 7,807,117,566.56
  5. Step 5: Solve for x
    x = 7,807,117,566.56/100,109.67
  6. Step 6: Final answer
    x = 77,985.65

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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.