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Finding the Fourth Proportional to 500,388.72, 690,365.07 and 285,374.22

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Solution

The fourth proportional to 500,388.72, 690,365.07 and 285,374.22 is: 393,718.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    500,388.72 : 690,365.07 = 285,374.22 : x
  2. Step 2: Convert to fraction form
    500,388.72/690,365.07 = 285,374.22/x
  3. Step 3: Cross multiply
    500,388.72x = 690,365.07 × 285,374.22
  4. Step 4: Simplify right side
    500,388.72x = 197,012,393,366.50
  5. Step 5: Solve for x
    x = 197,012,393,366.50/500,388.72
  6. Step 6: Final answer
    x = 393,718.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.