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Finding the Fourth Proportional to 515,855.60, 710,709.72 and 399,167.88

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Solution

The fourth proportional to 515,855.60, 710,709.72 and 399,167.88 is: 549,945.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,855.60 : 710,709.72 = 399,167.88 : x
  2. Step 2: Convert to fraction form
    515,855.60/710,709.72 = 399,167.88/x
  3. Step 3: Cross multiply
    515,855.60x = 710,709.72 × 399,167.88
  4. Step 4: Simplify right side
    515,855.60x = 283,692,492,227.79
  5. Step 5: Solve for x
    x = 283,692,492,227.79/515,855.60
  6. Step 6: Final answer
    x = 549,945.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.