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Finding the Fourth Proportional to 130,980.60, 180,750.78 and 72,840.90

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Solution

The fourth proportional to 130,980.60, 180,750.78 and 72,840.90 is: 100,519.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,980.60 : 180,750.78 = 72,840.90 : x
  2. Step 2: Convert to fraction form
    130,980.60/180,750.78 = 72,840.90/x
  3. Step 3: Cross multiply
    130,980.60x = 180,750.78 × 72,840.90
  4. Step 4: Simplify right side
    130,980.60x = 13,166,049,490.90
  5. Step 5: Solve for x
    x = 13,166,049,490.90/130,980.60
  6. Step 6: Final answer
    x = 100,519.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.