Home / 38,720.51-53,434.78-21,728.39

Finding the Fourth Proportional to 38,720.51, 53,434.78 and 21,728.39

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Solution

The fourth proportional to 38,720.51, 53,434.78 and 21,728.39 is: 29,985.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,720.51 : 53,434.78 = 21,728.39 : x
  2. Step 2: Convert to fraction form
    38,720.51/53,434.78 = 21,728.39/x
  3. Step 3: Cross multiply
    38,720.51x = 53,434.78 × 21,728.39
  4. Step 4: Simplify right side
    38,720.51x = 1,161,051,818.67
  5. Step 5: Solve for x
    x = 1,161,051,818.67/38,720.51
  6. Step 6: Final answer
    x = 29,985.45

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Double scale
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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.