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Finding the Fourth Proportional to 70,815.85, 97,728.66 and 38,987.71

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Solution

The fourth proportional to 70,815.85, 97,728.66 and 38,987.71 is: 53,804.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,815.85 : 97,728.66 = 38,987.71 : x
  2. Step 2: Convert to fraction form
    70,815.85/97,728.66 = 38,987.71/x
  3. Step 3: Cross multiply
    70,815.85x = 97,728.66 × 38,987.71
  4. Step 4: Simplify right side
    70,815.85x = 3,810,216,654.77
  5. Step 5: Solve for x
    x = 3,810,216,654.77/70,815.85
  6. Step 6: Final answer
    x = 53,804.57

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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.