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Finding the Fourth Proportional to 485,622.60, 727,656.30 and 319,216.20

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Solution

The fourth proportional to 485,622.60, 727,656.30 and 319,216.20 is: 478,313.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,622.60 : 727,656.30 = 319,216.20 : x
  2. Step 2: Convert to fraction form
    485,622.60/727,656.30 = 319,216.20/x
  3. Step 3: Cross multiply
    485,622.60x = 727,656.30 × 319,216.20
  4. Step 4: Simplify right side
    485,622.60x = 232,279,678,992.06
  5. Step 5: Solve for x
    x = 232,279,678,992.06/485,622.60
  6. Step 6: Final answer
    x = 478,313.16

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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.