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Finding the Fourth Proportional to 38,499, 53,128.78 and 20,835

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Solution

The fourth proportional to 38,499, 53,128.78 and 20,835 is: 28,752.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,499 : 53,128.78 = 20,835 : x
  2. Step 2: Convert to fraction form
    38,499/53,128.78 = 20,835/x
  3. Step 3: Cross multiply
    38,499x = 53,128.78 × 20,835
  4. Step 4: Simplify right side
    38,499x = 1,106,938,131.30
  5. Step 5: Solve for x
    x = 1,106,938,131.30/38,499
  6. Step 6: Final answer
    x = 28,752.39

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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.