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Finding the Fourth Proportional to 78,077.92, 117,117.18 and 18,913.50

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Solution

The fourth proportional to 78,077.92, 117,117.18 and 18,913.50 is: 28,370.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,077.92 : 117,117.18 = 18,913.50 : x
  2. Step 2: Convert to fraction form
    78,077.92/117,117.18 = 18,913.50/x
  3. Step 3: Cross multiply
    78,077.92x = 117,117.18 × 18,913.50
  4. Step 4: Simplify right side
    78,077.92x = 2,215,095,783.93
  5. Step 5: Solve for x
    x = 2,215,095,783.93/78,077.92
  6. Step 6: Final answer
    x = 28,370.32

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1.5x scale

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.