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Finding the Fourth Proportional to 661,674.80, 912,680.52 and 389,513.18

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Solution

The fourth proportional to 661,674.80, 912,680.52 and 389,513.18 is: 537,274.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,674.80 : 912,680.52 = 389,513.18 : x
  2. Step 2: Convert to fraction form
    661,674.80/912,680.52 = 389,513.18/x
  3. Step 3: Cross multiply
    661,674.80x = 912,680.52 × 389,513.18
  4. Step 4: Simplify right side
    661,674.80x = 355,501,091,669.25
  5. Step 5: Solve for x
    x = 355,501,091,669.25/661,674.80
  6. Step 6: Final answer
    x = 537,274.64

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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.