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Finding the Fourth Proportional to 458,238.80, 687,358.20 and 399,189.80

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Solution

The fourth proportional to 458,238.80, 687,358.20 and 399,189.80 is: 598,784.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,238.80 : 687,358.20 = 399,189.80 : x
  2. Step 2: Convert to fraction form
    458,238.80/687,358.20 = 399,189.80/x
  3. Step 3: Cross multiply
    458,238.80x = 687,358.20 × 399,189.80
  4. Step 4: Simplify right side
    458,238.80x = 274,386,382,386.36
  5. Step 5: Solve for x
    x = 274,386,382,386.36/458,238.80
  6. Step 6: Final answer
    x = 598,784.70

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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.