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Finding the Fourth Proportional to 487,191.93, 671,991.26 and 317,655.69

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Solution

The fourth proportional to 487,191.93, 671,991.26 and 317,655.69 is: 438,147.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,191.93 : 671,991.26 = 317,655.69 : x
  2. Step 2: Convert to fraction form
    487,191.93/671,991.26 = 317,655.69/x
  3. Step 3: Cross multiply
    487,191.93x = 671,991.26 × 317,655.69
  4. Step 4: Simplify right side
    487,191.93x = 213,461,847,369.27
  5. Step 5: Solve for x
    x = 213,461,847,369.27/487,191.93
  6. Step 6: Final answer
    x = 438,147.34

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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.