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Finding the Fourth Proportional to 405,328.80, 608,005.48 and 139,085.52

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Solution

The fourth proportional to 405,328.80, 608,005.48 and 139,085.52 is: 208,632.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,328.80 : 608,005.48 = 139,085.52 : x
  2. Step 2: Convert to fraction form
    405,328.80/608,005.48 = 139,085.52/x
  3. Step 3: Cross multiply
    405,328.80x = 608,005.48 × 139,085.52
  4. Step 4: Simplify right side
    405,328.80x = 84,564,758,348.65
  5. Step 5: Solve for x
    x = 84,564,758,348.65/405,328.80
  6. Step 6: Final answer
    x = 208,632.49

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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.