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Finding the Fourth Proportional to 128,970.60, 193,455.90 and 86,980.20

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Solution

The fourth proportional to 128,970.60, 193,455.90 and 86,980.20 is: 130,470.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,970.60 : 193,455.90 = 86,980.20 : x
  2. Step 2: Convert to fraction form
    128,970.60/193,455.90 = 86,980.20/x
  3. Step 3: Cross multiply
    128,970.60x = 193,455.90 × 86,980.20
  4. Step 4: Simplify right side
    128,970.60x = 16,826,832,873.18
  5. Step 5: Solve for x
    x = 16,826,832,873.18/128,970.60
  6. Step 6: Final answer
    x = 130,470.30

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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.