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Finding the Fourth Proportional to 288,399.88, 432,649.64 and 128,532.61

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Solution

The fourth proportional to 288,399.88, 432,649.64 and 128,532.61 is: 192,821.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    288,399.88 : 432,649.64 = 128,532.61 : x
  2. Step 2: Convert to fraction form
    288,399.88/432,649.64 = 128,532.61/x
  3. Step 3: Cross multiply
    288,399.88x = 432,649.64 × 128,532.61
  4. Step 4: Simplify right side
    288,399.88x = 55,609,587,444.76
  5. Step 5: Solve for x
    x = 55,609,587,444.76/288,399.88
  6. Step 6: Final answer
    x = 192,821.12

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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.