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Finding the Fourth Proportional to 213,647.80, 320,312.12 and 129,387.48

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Solution

The fourth proportional to 213,647.80, 320,312.12 and 129,387.48 is: 193,984.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,647.80 : 320,312.12 = 129,387.48 : x
  2. Step 2: Convert to fraction form
    213,647.80/320,312.12 = 129,387.48/x
  3. Step 3: Cross multiply
    213,647.80x = 320,312.12 × 129,387.48
  4. Step 4: Simplify right side
    213,647.80x = 41,444,376,899.95
  5. Step 5: Solve for x
    x = 41,444,376,899.95/213,647.80
  6. Step 6: Final answer
    x = 193,984.57

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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.