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Finding the Fourth Proportional to 158,336.13, 218,503.95 and 86,720.67

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Solution

The fourth proportional to 158,336.13, 218,503.95 and 86,720.67 is: 119,674.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,336.13 : 218,503.95 = 86,720.67 : x
  2. Step 2: Convert to fraction form
    158,336.13/218,503.95 = 86,720.67/x
  3. Step 3: Cross multiply
    158,336.13x = 218,503.95 × 86,720.67
  4. Step 4: Simplify right side
    158,336.13x = 18,948,808,941.65
  5. Step 5: Solve for x
    x = 18,948,808,941.65/158,336.13
  6. Step 6: Final answer
    x = 119,674.57

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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.