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Finding the Fourth Proportional to 390,087.36, 585,131.04 and 137,308.32

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Solution

The fourth proportional to 390,087.36, 585,131.04 and 137,308.32 is: 205,962.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,087.36 : 585,131.04 = 137,308.32 : x
  2. Step 2: Convert to fraction form
    390,087.36/585,131.04 = 137,308.32/x
  3. Step 3: Cross multiply
    390,087.36x = 585,131.04 × 137,308.32
  4. Step 4: Simplify right side
    390,087.36x = 80,343,360,082.25
  5. Step 5: Solve for x
    x = 80,343,360,082.25/390,087.36
  6. Step 6: Final answer
    x = 205,962.48

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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.