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Finding the Fourth Proportional to 715,740, 987,733.68 and 393,463.68

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Solution

The fourth proportional to 715,740, 987,733.68 and 393,463.68 is: 542,986.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,740 : 987,733.68 = 393,463.68 : x
  2. Step 2: Convert to fraction form
    715,740/987,733.68 = 393,463.68/x
  3. Step 3: Cross multiply
    715,740x = 987,733.68 × 393,463.68
  4. Step 4: Simplify right side
    715,740x = 388,637,328,592.74
  5. Step 5: Solve for x
    x = 388,637,328,592.74/715,740
  6. Step 6: Final answer
    x = 542,986.74

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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.