Home / 78,005.20-117,007.80-31,291.60

Finding the Fourth Proportional to 78,005.20, 117,007.80 and 31,291.60

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Solution

The fourth proportional to 78,005.20, 117,007.80 and 31,291.60 is: 46,937.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,005.20 : 117,007.80 = 31,291.60 : x
  2. Step 2: Convert to fraction form
    78,005.20/117,007.80 = 31,291.60/x
  3. Step 3: Cross multiply
    78,005.20x = 117,007.80 × 31,291.60
  4. Step 4: Simplify right side
    78,005.20x = 3,661,361,274.48
  5. Step 5: Solve for x
    x = 3,661,361,274.48/78,005.20
  6. Step 6: Final answer
    x = 46,937.40

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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.