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Finding the Fourth Proportional to 661,507.82, 912,770.13 and 389,629.85

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Solution

The fourth proportional to 661,507.82, 912,770.13 and 389,629.85 is: 537,624.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,507.82 : 912,770.13 = 389,629.85 : x
  2. Step 2: Convert to fraction form
    661,507.82/912,770.13 = 389,629.85/x
  3. Step 3: Cross multiply
    661,507.82x = 912,770.13 × 389,629.85
  4. Step 4: Simplify right side
    661,507.82x = 355,642,484,089.89
  5. Step 5: Solve for x
    x = 355,642,484,089.89/661,507.82
  6. Step 6: Final answer
    x = 537,624.01

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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.