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Finding the Fourth Proportional to 720,132, 993,782.16 and 418,345.44

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Solution

The fourth proportional to 720,132, 993,782.16 and 418,345.44 is: 577,316.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,132 : 993,782.16 = 418,345.44 : x
  2. Step 2: Convert to fraction form
    720,132/993,782.16 = 418,345.44/x
  3. Step 3: Cross multiply
    720,132x = 993,782.16 × 418,345.44
  4. Step 4: Simplify right side
    720,132x = 415,744,234,989.35
  5. Step 5: Solve for x
    x = 415,744,234,989.35/720,132
  6. Step 6: Final answer
    x = 577,316.71

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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.