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Finding the Fourth Proportional to 648,205.40, 972,308.10 and 423,819.20

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Solution

The fourth proportional to 648,205.40, 972,308.10 and 423,819.20 is: 635,728.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    648,205.40 : 972,308.10 = 423,819.20 : x
  2. Step 2: Convert to fraction form
    648,205.40/972,308.10 = 423,819.20/x
  3. Step 3: Cross multiply
    648,205.40x = 972,308.10 × 423,819.20
  4. Step 4: Simplify right side
    648,205.40x = 412,082,841,095.52
  5. Step 5: Solve for x
    x = 412,082,841,095.52/648,205.40
  6. Step 6: Final answer
    x = 635,728.80

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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.