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Finding the Fourth Proportional to 78,779.93, 108,716.78 and 42,970.64

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Solution

The fourth proportional to 78,779.93, 108,716.78 and 42,970.64 is: 59,299.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,779.93 : 108,716.78 = 42,970.64 : x
  2. Step 2: Convert to fraction form
    78,779.93/108,716.78 = 42,970.64/x
  3. Step 3: Cross multiply
    78,779.93x = 108,716.78 × 42,970.64
  4. Step 4: Simplify right side
    78,779.93x = 4,671,629,179.18
  5. Step 5: Solve for x
    x = 4,671,629,179.18/78,779.93
  6. Step 6: Final answer
    x = 59,299.74

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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.