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Finding the Fourth Proportional to 139,281.48, 192,207.36 and 75,618

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Solution

The fourth proportional to 139,281.48, 192,207.36 and 75,618 is: 104,352.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,281.48 : 192,207.36 = 75,618 : x
  2. Step 2: Convert to fraction form
    139,281.48/192,207.36 = 75,618/x
  3. Step 3: Cross multiply
    139,281.48x = 192,207.36 × 75,618
  4. Step 4: Simplify right side
    139,281.48x = 14,534,336,148.48
  5. Step 5: Solve for x
    x = 14,534,336,148.48/139,281.48
  6. Step 6: Final answer
    x = 104,352.25

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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.