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Finding the Fourth Proportional to 645,489.66, 890,713.38 and 373,503.40

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Solution

The fourth proportional to 645,489.66, 890,713.38 and 373,503.40 is: 515,398.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,489.66 : 890,713.38 = 373,503.40 : x
  2. Step 2: Convert to fraction form
    645,489.66/890,713.38 = 373,503.40/x
  3. Step 3: Cross multiply
    645,489.66x = 890,713.38 × 373,503.40
  4. Step 4: Simplify right side
    645,489.66x = 332,684,475,855.49
  5. Step 5: Solve for x
    x = 332,684,475,855.49/645,489.66
  6. Step 6: Final answer
    x = 515,398.61

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Double scale
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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.