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Finding the Fourth Proportional to 390,817.03, 586,120.08 and 138,064.25

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Solution

The fourth proportional to 390,817.03, 586,120.08 and 138,064.25 is: 207,059.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,817.03 : 586,120.08 = 138,064.25 : x
  2. Step 2: Convert to fraction form
    390,817.03/586,120.08 = 138,064.25/x
  3. Step 3: Cross multiply
    390,817.03x = 586,120.08 × 138,064.25
  4. Step 4: Simplify right side
    390,817.03x = 80,922,225,634.22
  5. Step 5: Solve for x
    x = 80,922,225,634.22/390,817.03
  6. Step 6: Final answer
    x = 207,059.11

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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.