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Finding the Fourth Proportional to 78,889.19, 118,260.66 and 31,492.80

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Solution

The fourth proportional to 78,889.19, 118,260.66 and 31,492.80 is: 47,210.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,889.19 : 118,260.66 = 31,492.80 : x
  2. Step 2: Convert to fraction form
    78,889.19/118,260.66 = 31,492.80/x
  3. Step 3: Cross multiply
    78,889.19x = 118,260.66 × 31,492.80
  4. Step 4: Simplify right side
    78,889.19x = 3,724,359,254.20
  5. Step 5: Solve for x
    x = 3,724,359,254.20/78,889.19
  6. Step 6: Final answer
    x = 47,210.01

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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.