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Finding the Fourth Proportional to 157,672, 217,592 and 86,056.60

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Solution

The fourth proportional to 157,672, 217,592 and 86,056.60 is: 118,760.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,672 : 217,592 = 86,056.60 : x
  2. Step 2: Convert to fraction form
    157,672/217,592 = 86,056.60/x
  3. Step 3: Cross multiply
    157,672x = 217,592 × 86,056.60
  4. Step 4: Simplify right side
    157,672x = 18,725,227,707.20
  5. Step 5: Solve for x
    x = 18,725,227,707.20/157,672
  6. Step 6: Final answer
    x = 118,760.64

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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.