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Finding the Fourth Proportional to 70,818.94, 97,729.32 and 38,987.20

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Solution

The fourth proportional to 70,818.94, 97,729.32 and 38,987.20 is: 53,801.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,818.94 : 97,729.32 = 38,987.20 : x
  2. Step 2: Convert to fraction form
    70,818.94/97,729.32 = 38,987.20/x
  3. Step 3: Cross multiply
    70,818.94x = 97,729.32 × 38,987.20
  4. Step 4: Simplify right side
    70,818.94x = 3,810,192,544.70
  5. Step 5: Solve for x
    x = 3,810,192,544.70/70,818.94
  6. Step 6: Final answer
    x = 53,801.89

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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.