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Finding the Fourth Proportional to 86,788.48, 130,181.76 and 21,124.48

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Solution

The fourth proportional to 86,788.48, 130,181.76 and 21,124.48 is: 31,686.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,788.48 : 130,181.76 = 21,124.48 : x
  2. Step 2: Convert to fraction form
    86,788.48/130,181.76 = 21,124.48/x
  3. Step 3: Cross multiply
    86,788.48x = 130,181.76 × 21,124.48
  4. Step 4: Simplify right side
    86,788.48x = 2,750,021,985.48
  5. Step 5: Solve for x
    x = 2,750,021,985.48/86,788.48
  6. Step 6: Final answer
    x = 31,686.49

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1.5x scale

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.