Home / 81,438.80-121,985.40-53,445.20

Finding the Fourth Proportional to 81,438.80, 121,985.40 and 53,445.20

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Solution

The fourth proportional to 81,438.80, 121,985.40 and 53,445.20 is: 80,054.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,438.80 : 121,985.40 = 53,445.20 : x
  2. Step 2: Convert to fraction form
    81,438.80/121,985.40 = 53,445.20/x
  3. Step 3: Cross multiply
    81,438.80x = 121,985.40 × 53,445.20
  4. Step 4: Simplify right side
    81,438.80x = 6,519,534,100.08
  5. Step 5: Solve for x
    x = 6,519,534,100.08/81,438.80
  6. Step 6: Final answer
    x = 80,054.40

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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.