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Finding the Fourth Proportional to 78,734.64, 108,421.56 and 70,348.08

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Solution

The fourth proportional to 78,734.64, 108,421.56 and 70,348.08 is: 96,872.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,734.64 : 108,421.56 = 70,348.08 : x
  2. Step 2: Convert to fraction form
    78,734.64/108,421.56 = 70,348.08/x
  3. Step 3: Cross multiply
    78,734.64x = 108,421.56 × 70,348.08
  4. Step 4: Simplify right side
    78,734.64x = 7,627,248,576.60
  5. Step 5: Solve for x
    x = 7,627,248,576.60/78,734.64
  6. Step 6: Final answer
    x = 96,872.84

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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.