Home / 81,189.48-121,782.76-31,280.40

Finding the Fourth Proportional to 81,189.48, 121,782.76 and 31,280.40

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Solution

The fourth proportional to 81,189.48, 121,782.76 and 31,280.40 is: 46,920.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,189.48 : 121,782.76 = 31,280.40 : x
  2. Step 2: Convert to fraction form
    81,189.48/121,782.76 = 31,280.40/x
  3. Step 3: Cross multiply
    81,189.48x = 121,782.76 × 31,280.40
  4. Step 4: Simplify right side
    81,189.48x = 3,809,413,445.90
  5. Step 5: Solve for x
    x = 3,809,413,445.90/81,189.48
  6. Step 6: Final answer
    x = 46,920.04

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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.