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Finding the Fourth Proportional to 78,818.59, 108,768.76 and 43,009.20

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Solution

The fourth proportional to 78,818.59, 108,768.76 and 43,009.20 is: 59,352.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,818.59 : 108,768.76 = 43,009.20 : x
  2. Step 2: Convert to fraction form
    78,818.59/108,768.76 = 43,009.20/x
  3. Step 3: Cross multiply
    78,818.59x = 108,768.76 × 43,009.20
  4. Step 4: Simplify right side
    78,818.59x = 4,678,057,352.59
  5. Step 5: Solve for x
    x = 4,678,057,352.59/78,818.59
  6. Step 6: Final answer
    x = 59,352.21

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1.5x scale

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.