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Finding the Fourth Proportional to 390,090.55, 585,182.73 and 137,318.54

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Solution

The fourth proportional to 390,090.55, 585,182.73 and 137,318.54 is: 205,994.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,090.55 : 585,182.73 = 137,318.54 : x
  2. Step 2: Convert to fraction form
    390,090.55/585,182.73 = 137,318.54/x
  3. Step 3: Cross multiply
    390,090.55x = 585,182.73 × 137,318.54
  4. Step 4: Simplify right side
    390,090.55x = 80,356,438,225.08
  5. Step 5: Solve for x
    x = 80,356,438,225.08/390,090.55
  6. Step 6: Final answer
    x = 205,994.32

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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.