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Finding the Fourth Proportional to 390,758.72, 586,131.68 and 124,515.68

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Solution

The fourth proportional to 390,758.72, 586,131.68 and 124,515.68 is: 186,771.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,758.72 : 586,131.68 = 124,515.68 : x
  2. Step 2: Convert to fraction form
    390,758.72/586,131.68 = 124,515.68/x
  3. Step 3: Cross multiply
    390,758.72x = 586,131.68 × 124,515.68
  4. Step 4: Simplify right side
    390,758.72x = 72,982,584,704.74
  5. Step 5: Solve for x
    x = 72,982,584,704.74/390,758.72
  6. Step 6: Final answer
    x = 186,771.48

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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.