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Finding the Fourth Proportional to 125,212, 172,792.56 and 72,220

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Solution

The fourth proportional to 125,212, 172,792.56 and 72,220 is: 99,663.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,212 : 172,792.56 = 72,220 : x
  2. Step 2: Convert to fraction form
    125,212/172,792.56 = 72,220/x
  3. Step 3: Cross multiply
    125,212x = 172,792.56 × 72,220
  4. Step 4: Simplify right side
    125,212x = 12,479,078,683.20
  5. Step 5: Solve for x
    x = 12,479,078,683.20/125,212
  6. Step 6: Final answer
    x = 99,663.60

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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.