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Finding the Fourth Proportional to 38,640.98, 53,328.98 and 21,649.82

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Solution

The fourth proportional to 38,640.98, 53,328.98 and 21,649.82 is: 29,879.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,640.98 : 53,328.98 = 21,649.82 : x
  2. Step 2: Convert to fraction form
    38,640.98/53,328.98 = 21,649.82/x
  3. Step 3: Cross multiply
    38,640.98x = 53,328.98 × 21,649.82
  4. Step 4: Simplify right side
    38,640.98x = 1,154,562,605.26
  5. Step 5: Solve for x
    x = 1,154,562,605.26/38,640.98
  6. Step 6: Final answer
    x = 29,879.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.