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Finding the Fourth Proportional to 72,779.18, 100,428.12 and 40,947.39

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Solution

The fourth proportional to 72,779.18, 100,428.12 and 40,947.39 is: 56,503.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,779.18 : 100,428.12 = 40,947.39 : x
  2. Step 2: Convert to fraction form
    72,779.18/100,428.12 = 40,947.39/x
  3. Step 3: Cross multiply
    72,779.18x = 100,428.12 × 40,947.39
  4. Step 4: Simplify right side
    72,779.18x = 4,112,269,396.61
  5. Step 5: Solve for x
    x = 4,112,269,396.61/72,779.18
  6. Step 6: Final answer
    x = 56,503.38

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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.