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Finding the Fourth Proportional to 661,698.28, 912,896.22 and 389,599.84

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Solution

The fourth proportional to 661,698.28, 912,896.22 and 389,599.84 is: 537,502.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,698.28 : 912,896.22 = 389,599.84 : x
  2. Step 2: Convert to fraction form
    661,698.28/912,896.22 = 389,599.84/x
  3. Step 3: Cross multiply
    661,698.28x = 912,896.22 × 389,599.84
  4. Step 4: Simplify right side
    661,698.28x = 355,664,221,248.61
  5. Step 5: Solve for x
    x = 355,664,221,248.61/661,698.28
  6. Step 6: Final answer
    x = 537,502.11

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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.