Home / 81,281.20-121,921.80-72,468.40

Finding the Fourth Proportional to 81,281.20, 121,921.80 and 72,468.40

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Solution

The fourth proportional to 81,281.20, 121,921.80 and 72,468.40 is: 108,702.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,281.20 : 121,921.80 = 72,468.40 : x
  2. Step 2: Convert to fraction form
    81,281.20/121,921.80 = 72,468.40/x
  3. Step 3: Cross multiply
    81,281.20x = 121,921.80 × 72,468.40
  4. Step 4: Simplify right side
    81,281.20x = 8,835,477,771.12
  5. Step 5: Solve for x
    x = 8,835,477,771.12/81,281.20
  6. Step 6: Final answer
    x = 108,702.60

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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.