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Finding the Fourth Proportional to 500,490.08, 690,613.20 and 398,773.28

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Solution

The fourth proportional to 500,490.08, 690,613.20 and 398,773.28 is: 550,256.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    500,490.08 : 690,613.20 = 398,773.28 : x
  2. Step 2: Convert to fraction form
    500,490.08/690,613.20 = 398,773.28/x
  3. Step 3: Cross multiply
    500,490.08x = 690,613.20 × 398,773.28
  4. Step 4: Simplify right side
    500,490.08x = 275,398,090,975.30
  5. Step 5: Solve for x
    x = 275,398,090,975.30/500,490.08
  6. Step 6: Final answer
    x = 550,256.84

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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.