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Finding the Fourth Proportional to 78,403.71, 117,013.06 and 70,836.92

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Solution

The fourth proportional to 78,403.71, 117,013.06 and 70,836.92 is: 105,720.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,403.71 : 117,013.06 = 70,836.92 : x
  2. Step 2: Convert to fraction form
    78,403.71/117,013.06 = 70,836.92/x
  3. Step 3: Cross multiply
    78,403.71x = 117,013.06 × 70,836.92
  4. Step 4: Simplify right side
    78,403.71x = 8,288,844,770.18
  5. Step 5: Solve for x
    x = 8,288,844,770.18/78,403.71
  6. Step 6: Final answer
    x = 105,720.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.