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Finding the Fourth Proportional to 648,203.40, 972,305.10 and 423,817.20

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Solution

The fourth proportional to 648,203.40, 972,305.10 and 423,817.20 is: 635,725.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    648,203.40 : 972,305.10 = 423,817.20 : x
  2. Step 2: Convert to fraction form
    648,203.40/972,305.10 = 423,817.20/x
  3. Step 3: Cross multiply
    648,203.40x = 972,305.10 × 423,817.20
  4. Step 4: Simplify right side
    648,203.40x = 412,079,625,027.72
  5. Step 5: Solve for x
    x = 412,079,625,027.72/648,203.40
  6. Step 6: Final answer
    x = 635,725.80

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.