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Finding the Fourth Proportional to 478,851.30, 717,402.15 and 389,621.70

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Solution

The fourth proportional to 478,851.30, 717,402.15 and 389,621.70 is: 583,720.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,851.30 : 717,402.15 = 389,621.70 : x
  2. Step 2: Convert to fraction form
    478,851.30/717,402.15 = 389,621.70/x
  3. Step 3: Cross multiply
    478,851.30x = 717,402.15 × 389,621.70
  4. Step 4: Simplify right side
    478,851.30x = 279,515,445,266.66
  5. Step 5: Solve for x
    x = 279,515,445,266.66/478,851.30
  6. Step 6: Final answer
    x = 583,720.76

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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.