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Finding the Fourth Proportional to 390,984.64, 586,525.20 and 138,212.96

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Solution

The fourth proportional to 390,984.64, 586,525.20 and 138,212.96 is: 207,336.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,984.64 : 586,525.20 = 138,212.96 : x
  2. Step 2: Convert to fraction form
    390,984.64/586,525.20 = 138,212.96/x
  3. Step 3: Cross multiply
    390,984.64x = 586,525.20 × 138,212.96
  4. Step 4: Simplify right side
    390,984.64x = 81,065,384,006.59
  5. Step 5: Solve for x
    x = 81,065,384,006.59/390,984.64
  6. Step 6: Final answer
    x = 207,336.49

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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.