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Finding the Fourth Proportional to 99,820.80, 149,731.20 and 47,332.80

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Solution

The fourth proportional to 99,820.80, 149,731.20 and 47,332.80 is: 70,999.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,820.80 : 149,731.20 = 47,332.80 : x
  2. Step 2: Convert to fraction form
    99,820.80/149,731.20 = 47,332.80/x
  3. Step 3: Cross multiply
    99,820.80x = 149,731.20 × 47,332.80
  4. Step 4: Simplify right side
    99,820.80x = 7,087,196,943.36
  5. Step 5: Solve for x
    x = 7,087,196,943.36/99,820.80
  6. Step 6: Final answer
    x = 70,999.20

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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.