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Finding the Fourth Proportional to 80,985.60, 121,478.40 and 72,230.40

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Solution

The fourth proportional to 80,985.60, 121,478.40 and 72,230.40 is: 108,345.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,985.60 : 121,478.40 = 72,230.40 : x
  2. Step 2: Convert to fraction form
    80,985.60/121,478.40 = 72,230.40/x
  3. Step 3: Cross multiply
    80,985.60x = 121,478.40 × 72,230.40
  4. Step 4: Simplify right side
    80,985.60x = 8,774,433,423.36
  5. Step 5: Solve for x
    x = 8,774,433,423.36/80,985.60
  6. Step 6: Final answer
    x = 108,345.60

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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.