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Finding the Fourth Proportional to 309,389.80, 464,085.10 and 84,752.21

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Solution

The fourth proportional to 309,389.80, 464,085.10 and 84,752.21 is: 127,128.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,389.80 : 464,085.10 = 84,752.21 : x
  2. Step 2: Convert to fraction form
    309,389.80/464,085.10 = 84,752.21/x
  3. Step 3: Cross multiply
    309,389.80x = 464,085.10 × 84,752.21
  4. Step 4: Simplify right side
    309,389.80x = 39,332,237,429.31
  5. Step 5: Solve for x
    x = 39,332,237,429.31/309,389.80
  6. Step 6: Final answer
    x = 127,128.42

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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.