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Finding the Fourth Proportional to 38,420.13, 53,020.19 and 21,653.13

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Solution

The fourth proportional to 38,420.13, 53,020.19 and 21,653.13 is: 29,881.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,420.13 : 53,020.19 = 21,653.13 : x
  2. Step 2: Convert to fraction form
    38,420.13/53,020.19 = 21,653.13/x
  3. Step 3: Cross multiply
    38,420.13x = 53,020.19 × 21,653.13
  4. Step 4: Simplify right side
    38,420.13x = 1,148,053,066.69
  5. Step 5: Solve for x
    x = 1,148,053,066.69/38,420.13
  6. Step 6: Final answer
    x = 29,881.55

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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.