Home / 78,728.36-118,140.32-31,980.02

Finding the Fourth Proportional to 78,728.36, 118,140.32 and 31,980.02

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Solution

The fourth proportional to 78,728.36, 118,140.32 and 31,980.02 is: 47,989.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,728.36 : 118,140.32 = 31,980.02 : x
  2. Step 2: Convert to fraction form
    78,728.36/118,140.32 = 31,980.02/x
  3. Step 3: Cross multiply
    78,728.36x = 118,140.32 × 31,980.02
  4. Step 4: Simplify right side
    78,728.36x = 3,778,129,285.65
  5. Step 5: Solve for x
    x = 3,778,129,285.65/78,728.36
  6. Step 6: Final answer
    x = 47,989.44

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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.