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Finding the Fourth Proportional to 78,646.84, 108,528.90 and 42,836.68

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Solution

The fourth proportional to 78,646.84, 108,528.90 and 42,836.68 is: 59,112.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,646.84 : 108,528.90 = 42,836.68 : x
  2. Step 2: Convert to fraction form
    78,646.84/108,528.90 = 42,836.68/x
  3. Step 3: Cross multiply
    78,646.84x = 108,528.90 × 42,836.68
  4. Step 4: Simplify right side
    78,646.84x = 4,649,017,760.05
  5. Step 5: Solve for x
    x = 4,649,017,760.05/78,646.84
  6. Step 6: Final answer
    x = 59,112.58

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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.