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Finding the Fourth Proportional to 661,534.98, 912,958.12 and 389,784

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Solution

The fourth proportional to 661,534.98, 912,958.12 and 389,784 is: 537,925.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,534.98 : 912,958.12 = 389,784 : x
  2. Step 2: Convert to fraction form
    661,534.98/912,958.12 = 389,784/x
  3. Step 3: Cross multiply
    661,534.98x = 912,958.12 × 389,784
  4. Step 4: Simplify right side
    661,534.98x = 355,856,467,846.08
  5. Step 5: Solve for x
    x = 355,856,467,846.08/661,534.98
  6. Step 6: Final answer
    x = 537,925.40

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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.