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Finding the Fourth Proportional to 315,675.45, 435,615.89 and 172,407.82

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Solution

The fourth proportional to 315,675.45, 435,615.89 and 172,407.82 is: 237,913.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,675.45 : 435,615.89 = 172,407.82 : x
  2. Step 2: Convert to fraction form
    315,675.45/435,615.89 = 172,407.82/x
  3. Step 3: Cross multiply
    315,675.45x = 435,615.89 × 172,407.82
  4. Step 4: Simplify right side
    315,675.45x = 75,103,583,835.24
  5. Step 5: Solve for x
    x = 75,103,583,835.24/315,675.45
  6. Step 6: Final answer
    x = 237,913.92

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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.