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Finding the Fourth Proportional to 122,117.80, 183,176.70 and 86,688.40

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Solution

The fourth proportional to 122,117.80, 183,176.70 and 86,688.40 is: 130,032.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,117.80 : 183,176.70 = 86,688.40 : x
  2. Step 2: Convert to fraction form
    122,117.80/183,176.70 = 86,688.40/x
  3. Step 3: Cross multiply
    122,117.80x = 183,176.70 × 86,688.40
  4. Step 4: Simplify right side
    122,117.80x = 15,879,295,040.28
  5. Step 5: Solve for x
    x = 15,879,295,040.28/122,117.80
  6. Step 6: Final answer
    x = 130,032.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.