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Finding the Fourth Proportional to 86,672, 130,008 and 21,008

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Solution

The fourth proportional to 86,672, 130,008 and 21,008 is: 31,512

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,672 : 130,008 = 21,008 : x
  2. Step 2: Convert to fraction form
    86,672/130,008 = 21,008/x
  3. Step 3: Cross multiply
    86,672x = 130,008 × 21,008
  4. Step 4: Simplify right side
    86,672x = 2,731,208,064
  5. Step 5: Solve for x
    x = 2,731,208,064/86,672
  6. Step 6: Final answer
    x = 31,512

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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.