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Finding the Fourth Proportional to 478,840.30, 718,260.45 and 212,317.90

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Solution

The fourth proportional to 478,840.30, 718,260.45 and 212,317.90 is: 318,476.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,840.30 : 718,260.45 = 212,317.90 : x
  2. Step 2: Convert to fraction form
    478,840.30/718,260.45 = 212,317.90/x
  3. Step 3: Cross multiply
    478,840.30x = 718,260.45 × 212,317.90
  4. Step 4: Simplify right side
    478,840.30x = 152,499,550,397.06
  5. Step 5: Solve for x
    x = 152,499,550,397.06/478,840.30
  6. Step 6: Final answer
    x = 318,476.85

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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.