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Finding the Fourth Proportional to 130,487.80, 195,731.70 and 77,999.80

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Solution

The fourth proportional to 130,487.80, 195,731.70 and 77,999.80 is: 116,999.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,487.80 : 195,731.70 = 77,999.80 : x
  2. Step 2: Convert to fraction form
    130,487.80/195,731.70 = 77,999.80/x
  3. Step 3: Cross multiply
    130,487.80x = 195,731.70 × 77,999.80
  4. Step 4: Simplify right side
    130,487.80x = 15,267,033,453.66
  5. Step 5: Solve for x
    x = 15,267,033,453.66/130,487.80
  6. Step 6: Final answer
    x = 116,999.70

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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.