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Finding the Fourth Proportional to 65,721.60, 90,676.80 and 38,851.20

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Solution

The fourth proportional to 65,721.60, 90,676.80 and 38,851.20 is: 53,603.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,721.60 : 90,676.80 = 38,851.20 : x
  2. Step 2: Convert to fraction form
    65,721.60/90,676.80 = 38,851.20/x
  3. Step 3: Cross multiply
    65,721.60x = 90,676.80 × 38,851.20
  4. Step 4: Simplify right side
    65,721.60x = 3,522,902,492.16
  5. Step 5: Solve for x
    x = 3,522,902,492.16/65,721.60
  6. Step 6: Final answer
    x = 53,603.42

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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.