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Finding the Fourth Proportional to 81,312.99, 121,969.62 and 53,409.30

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Solution

The fourth proportional to 81,312.99, 121,969.62 and 53,409.30 is: 80,114.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,312.99 : 121,969.62 = 53,409.30 : x
  2. Step 2: Convert to fraction form
    81,312.99/121,969.62 = 53,409.30/x
  3. Step 3: Cross multiply
    81,312.99x = 121,969.62 × 53,409.30
  4. Step 4: Simplify right side
    81,312.99x = 6,514,312,025.47
  5. Step 5: Solve for x
    x = 6,514,312,025.47/81,312.99
  6. Step 6: Final answer
    x = 80,114.04

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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.