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Finding the Fourth Proportional to 478,837.80, 718,256.70 and 212,315.40

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Solution

The fourth proportional to 478,837.80, 718,256.70 and 212,315.40 is: 318,473.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,837.80 : 718,256.70 = 212,315.40 : x
  2. Step 2: Convert to fraction form
    478,837.80/718,256.70 = 212,315.40/x
  3. Step 3: Cross multiply
    478,837.80x = 718,256.70 × 212,315.40
  4. Step 4: Simplify right side
    478,837.80x = 152,496,958,563.18
  5. Step 5: Solve for x
    x = 152,496,958,563.18/478,837.80
  6. Step 6: Final answer
    x = 318,473.10

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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.