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Finding the Fourth Proportional to 213,810.95, 320,460.48 and 99,805.37

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Solution

The fourth proportional to 213,810.95, 320,460.48 and 99,805.37 is: 149,588.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,810.95 : 320,460.48 = 99,805.37 : x
  2. Step 2: Convert to fraction form
    213,810.95/320,460.48 = 99,805.37/x
  3. Step 3: Cross multiply
    213,810.95x = 320,460.48 × 99,805.37
  4. Step 4: Simplify right side
    213,810.95x = 31,983,677,203.66
  5. Step 5: Solve for x
    x = 31,983,677,203.66/213,810.95
  6. Step 6: Final answer
    x = 149,588.58

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1.5x scale

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.