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Finding the Fourth Proportional to 478,664.40, 717,996.60 and 390,090.90

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Solution

The fourth proportional to 478,664.40, 717,996.60 and 390,090.90 is: 585,136.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,664.40 : 717,996.60 = 390,090.90 : x
  2. Step 2: Convert to fraction form
    478,664.40/717,996.60 = 390,090.90/x
  3. Step 3: Cross multiply
    478,664.40x = 717,996.60 × 390,090.90
  4. Step 4: Simplify right side
    478,664.40x = 280,083,939,890.94
  5. Step 5: Solve for x
    x = 280,083,939,890.94/478,664.40
  6. Step 6: Final answer
    x = 585,136.35

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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.