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Finding the Fourth Proportional to 478,642.60, 717,963.90 and 320,012.20

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Solution

The fourth proportional to 478,642.60, 717,963.90 and 320,012.20 is: 480,018.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,642.60 : 717,963.90 = 320,012.20 : x
  2. Step 2: Convert to fraction form
    478,642.60/717,963.90 = 320,012.20/x
  3. Step 3: Cross multiply
    478,642.60x = 717,963.90 × 320,012.20
  4. Step 4: Simplify right side
    478,642.60x = 229,757,207,159.58
  5. Step 5: Solve for x
    x = 229,757,207,159.58/478,642.60
  6. Step 6: Final answer
    x = 480,018.30

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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.