Home / 78,430.86-117,636.57-28,508.94

Finding the Fourth Proportional to 78,430.86, 117,636.57 and 28,508.94

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Solution

The fourth proportional to 78,430.86, 117,636.57 and 28,508.94 is: 42,759.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,430.86 : 117,636.57 = 28,508.94 : x
  2. Step 2: Convert to fraction form
    78,430.86/117,636.57 = 28,508.94/x
  3. Step 3: Cross multiply
    78,430.86x = 117,636.57 × 28,508.94
  4. Step 4: Simplify right side
    78,430.86x = 3,353,693,915.94
  5. Step 5: Solve for x
    x = 3,353,693,915.94/78,430.86
  6. Step 6: Final answer
    x = 42,759.88

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1.5x scale

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.