Home / 78,711.12-118,035.36-28,779.84

Finding the Fourth Proportional to 78,711.12, 118,035.36 and 28,779.84

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Solution

The fourth proportional to 78,711.12, 118,035.36 and 28,779.84 is: 43,158.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,711.12 : 118,035.36 = 28,779.84 : x
  2. Step 2: Convert to fraction form
    78,711.12/118,035.36 = 28,779.84/x
  3. Step 3: Cross multiply
    78,711.12x = 118,035.36 × 28,779.84
  4. Step 4: Simplify right side
    78,711.12x = 3,397,038,775.14
  5. Step 5: Solve for x
    x = 3,397,038,775.14/78,711.12
  6. Step 6: Final answer
    x = 43,158.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.