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Finding the Fourth Proportional to 719,135.72, 992,389 and 396,841.60

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Solution

The fourth proportional to 719,135.72, 992,389 and 396,841.60 is: 547,631.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,135.72 : 992,389 = 396,841.60 : x
  2. Step 2: Convert to fraction form
    719,135.72/992,389 = 396,841.60/x
  3. Step 3: Cross multiply
    719,135.72x = 992,389 × 396,841.60
  4. Step 4: Simplify right side
    719,135.72x = 393,821,238,582.40
  5. Step 5: Solve for x
    x = 393,821,238,582.40/719,135.72
  6. Step 6: Final answer
    x = 547,631.31

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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.