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Finding the Fourth Proportional to 719,988.56, 993,565.16 and 397,691.72

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Solution

The fourth proportional to 719,988.56, 993,565.16 and 397,691.72 is: 548,804.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,988.56 : 993,565.16 = 397,691.72 : x
  2. Step 2: Convert to fraction form
    719,988.56/993,565.16 = 397,691.72/x
  3. Step 3: Cross multiply
    719,988.56x = 993,565.16 × 397,691.72
  4. Step 4: Simplify right side
    719,988.56x = 395,132,637,412.48
  5. Step 5: Solve for x
    x = 395,132,637,412.48/719,988.56
  6. Step 6: Final answer
    x = 548,804.05

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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.