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Finding the Fourth Proportional to 127,980.30, 191,970.45 and 85,989.90

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Solution

The fourth proportional to 127,980.30, 191,970.45 and 85,989.90 is: 128,984.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,980.30 : 191,970.45 = 85,989.90 : x
  2. Step 2: Convert to fraction form
    127,980.30/191,970.45 = 85,989.90/x
  3. Step 3: Cross multiply
    127,980.30x = 191,970.45 × 85,989.90
  4. Step 4: Simplify right side
    127,980.30x = 16,507,519,798.46
  5. Step 5: Solve for x
    x = 16,507,519,798.46/127,980.30
  6. Step 6: Final answer
    x = 128,984.85

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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.