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Finding the Fourth Proportional to 715,686.15, 987,635.81 and 393,389.33

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Solution

The fourth proportional to 715,686.15, 987,635.81 and 393,389.33 is: 542,871.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,686.15 : 987,635.81 = 393,389.33 : x
  2. Step 2: Convert to fraction form
    715,686.15/987,635.81 = 393,389.33/x
  3. Step 3: Cross multiply
    715,686.15x = 987,635.81 × 393,389.33
  4. Step 4: Simplify right side
    715,686.15x = 388,525,382,674.78
  5. Step 5: Solve for x
    x = 388,525,382,674.78/715,686.15
  6. Step 6: Final answer
    x = 542,871.18

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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.