Home / 78,431.09-117,657.63-28,505.52

Finding the Fourth Proportional to 78,431.09, 117,657.63 and 28,505.52

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Solution

The fourth proportional to 78,431.09, 117,657.63 and 28,505.52 is: 42,762.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,431.09 : 117,657.63 = 28,505.52 : x
  2. Step 2: Convert to fraction form
    78,431.09/117,657.63 = 28,505.52/x
  3. Step 3: Cross multiply
    78,431.09x = 117,657.63 × 28,505.52
  4. Step 4: Simplify right side
    78,431.09x = 3,353,891,925.12
  5. Step 5: Solve for x
    x = 3,353,891,925.12/78,431.09
  6. Step 6: Final answer
    x = 42,762.28

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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.