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Finding the Fourth Proportional to 515,416.21, 771,681.81 and 388,659.74

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Solution

The fourth proportional to 515,416.21, 771,681.81 and 388,659.74 is: 581,901.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,416.21 : 771,681.81 = 388,659.74 : x
  2. Step 2: Convert to fraction form
    515,416.21/771,681.81 = 388,659.74/x
  3. Step 3: Cross multiply
    515,416.21x = 771,681.81 × 388,659.74
  4. Step 4: Simplify right side
    515,416.21x = 299,921,654,654.35
  5. Step 5: Solve for x
    x = 299,921,654,654.35/515,416.21
  6. Step 6: Final answer
    x = 581,901.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.