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Finding the Fourth Proportional to 81,210.40, 121,815.60 and 74,989.60

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Solution

The fourth proportional to 81,210.40, 121,815.60 and 74,989.60 is: 112,484.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,210.40 : 121,815.60 = 74,989.60 : x
  2. Step 2: Convert to fraction form
    81,210.40/121,815.60 = 74,989.60/x
  3. Step 3: Cross multiply
    81,210.40x = 121,815.60 × 74,989.60
  4. Step 4: Simplify right side
    81,210.40x = 9,134,903,117.76
  5. Step 5: Solve for x
    x = 9,134,903,117.76/81,210.40
  6. Step 6: Final answer
    x = 112,484.40

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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.