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Finding the Fourth Proportional to 716,163, 988,311.44 and 389,479

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Solution

The fourth proportional to 716,163, 988,311.44 and 389,479 is: 537,484.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,163 : 988,311.44 = 389,479 : x
  2. Step 2: Convert to fraction form
    716,163/988,311.44 = 389,479/x
  3. Step 3: Cross multiply
    716,163x = 988,311.44 × 389,479
  4. Step 4: Simplify right side
    716,163x = 384,926,551,339.76
  5. Step 5: Solve for x
    x = 384,926,551,339.76/716,163
  6. Step 6: Final answer
    x = 537,484.55

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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.