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Finding the Fourth Proportional to 390,859.20, 587,455.20 and 339,537.60

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Solution

The fourth proportional to 390,859.20, 587,455.20 and 339,537.60 is: 510,319.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,859.20 : 587,455.20 = 339,537.60 : x
  2. Step 2: Convert to fraction form
    390,859.20/587,455.20 = 339,537.60/x
  3. Step 3: Cross multiply
    390,859.20x = 587,455.20 × 339,537.60
  4. Step 4: Simplify right side
    390,859.20x = 199,463,128,715.52
  5. Step 5: Solve for x
    x = 199,463,128,715.52/390,859.20
  6. Step 6: Final answer
    x = 510,319.65

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1.5x scale

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.