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Finding the Fourth Proportional to 38,456.40, 53,069.78 and 21,689.40

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Solution

The fourth proportional to 38,456.40, 53,069.78 and 21,689.40 is: 29,931.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,456.40 : 53,069.78 = 21,689.40 : x
  2. Step 2: Convert to fraction form
    38,456.40/53,069.78 = 21,689.40/x
  3. Step 3: Cross multiply
    38,456.40x = 53,069.78 × 21,689.40
  4. Step 4: Simplify right side
    38,456.40x = 1,151,051,686.33
  5. Step 5: Solve for x
    x = 1,151,051,686.33/38,456.40
  6. Step 6: Final answer
    x = 29,931.34

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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.