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Finding the Fourth Proportional to 500,347.96, 690,416.94 and 398,631.40

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Solution

The fourth proportional to 500,347.96, 690,416.94 and 398,631.40 is: 550,060.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    500,347.96 : 690,416.94 = 398,631.40 : x
  2. Step 2: Convert to fraction form
    500,347.96/690,416.94 = 398,631.40/x
  3. Step 3: Cross multiply
    500,347.96x = 690,416.94 × 398,631.40
  4. Step 4: Simplify right side
    500,347.96x = 275,221,871,375.92
  5. Step 5: Solve for x
    x = 275,221,871,375.92/500,347.96
  6. Step 6: Final answer
    x = 550,060.94

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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.