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Finding the Fourth Proportional to 28,054.48, 38,712.48 and 15,478.40

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Solution

The fourth proportional to 28,054.48, 38,712.48 and 15,478.40 is: 21,358.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,054.48 : 38,712.48 = 15,478.40 : x
  2. Step 2: Convert to fraction form
    28,054.48/38,712.48 = 15,478.40/x
  3. Step 3: Cross multiply
    28,054.48x = 38,712.48 × 15,478.40
  4. Step 4: Simplify right side
    28,054.48x = 599,207,250.43
  5. Step 5: Solve for x
    x = 599,207,250.43/28,054.48
  6. Step 6: Final answer
    x = 21,358.70

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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.