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Finding the Fourth Proportional to 661,305.21, 912,807.41 and 389,351.49

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Solution

The fourth proportional to 661,305.21, 912,807.41 and 389,351.49 is: 537,426.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,305.21 : 912,807.41 = 389,351.49 : x
  2. Step 2: Convert to fraction form
    661,305.21/912,807.41 = 389,351.49/x
  3. Step 3: Cross multiply
    661,305.21x = 912,807.41 × 389,351.49
  4. Step 4: Simplify right side
    661,305.21x = 355,402,923,219.78
  5. Step 5: Solve for x
    x = 355,402,923,219.78/661,305.21
  6. Step 6: Final answer
    x = 537,426.47

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1.5x scale

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.