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Finding the Fourth Proportional to 390,069.72, 585,062.64 and 264,515.86

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Solution

The fourth proportional to 390,069.72, 585,062.64 and 264,515.86 is: 396,745.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,069.72 : 585,062.64 = 264,515.86 : x
  2. Step 2: Convert to fraction form
    390,069.72/585,062.64 = 264,515.86/x
  3. Step 3: Cross multiply
    390,069.72x = 585,062.64 × 264,515.86
  4. Step 4: Simplify right side
    390,069.72x = 154,758,347,373.47
  5. Step 5: Solve for x
    x = 154,758,347,373.47/390,069.72
  6. Step 6: Final answer
    x = 396,745.35

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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.