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Finding the Fourth Proportional to 661,325.31, 912,713.36 and 389,418.51

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Solution

The fourth proportional to 661,325.31, 912,713.36 and 389,418.51 is: 537,447.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,325.31 : 912,713.36 = 389,418.51 : x
  2. Step 2: Convert to fraction form
    661,325.31/912,713.36 = 389,418.51/x
  3. Step 3: Cross multiply
    661,325.31x = 912,713.36 × 389,418.51
  4. Step 4: Simplify right side
    661,325.31x = 355,427,474,761.20
  5. Step 5: Solve for x
    x = 355,427,474,761.20/661,325.31
  6. Step 6: Final answer
    x = 537,447.26

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Double scale
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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.