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Finding the Fourth Proportional to 645,490.90, 890,715.12 and 373,504.66

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Solution

The fourth proportional to 645,490.90, 890,715.12 and 373,504.66 is: 515,400.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,490.90 : 890,715.12 = 373,504.66 : x
  2. Step 2: Convert to fraction form
    645,490.90/890,715.12 = 373,504.66/x
  3. Step 3: Cross multiply
    645,490.90x = 890,715.12 × 373,504.66
  4. Step 4: Simplify right side
    645,490.90x = 332,686,248,052.46
  5. Step 5: Solve for x
    x = 332,686,248,052.46/645,490.90
  6. Step 6: Final answer
    x = 515,400.37

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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.