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Finding the Fourth Proportional to 213,350.65, 320,024.82 and 86,990.41

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Solution

The fourth proportional to 213,350.65, 320,024.82 and 86,990.41 is: 130,485.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,350.65 : 320,024.82 = 86,990.41 : x
  2. Step 2: Convert to fraction form
    213,350.65/320,024.82 = 86,990.41/x
  3. Step 3: Cross multiply
    213,350.65x = 320,024.82 × 86,990.41
  4. Step 4: Simplify right side
    213,350.65x = 27,839,088,701.85
  5. Step 5: Solve for x
    x = 27,839,088,701.85/213,350.65
  6. Step 6: Final answer
    x = 130,485.14

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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.