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Finding the Fourth Proportional to 38,710.28, 53,420.76 and 21,718.28

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Solution

The fourth proportional to 38,710.28, 53,420.76 and 21,718.28 is: 29,971.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,710.28 : 53,420.76 = 21,718.28 : x
  2. Step 2: Convert to fraction form
    38,710.28/53,420.76 = 21,718.28/x
  3. Step 3: Cross multiply
    38,710.28x = 53,420.76 × 21,718.28
  4. Step 4: Simplify right side
    38,710.28x = 1,160,206,756.39
  5. Step 5: Solve for x
    x = 1,160,206,756.39/38,710.28
  6. Step 6: Final answer
    x = 29,971.55

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Half scale
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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.