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Finding the Fourth Proportional to 86,392, 129,588 and 30,988

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Solution

The fourth proportional to 86,392, 129,588 and 30,988 is: 46,482

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,392 : 129,588 = 30,988 : x
  2. Step 2: Convert to fraction form
    86,392/129,588 = 30,988/x
  3. Step 3: Cross multiply
    86,392x = 129,588 × 30,988
  4. Step 4: Simplify right side
    86,392x = 4,015,672,944
  5. Step 5: Solve for x
    x = 4,015,672,944/86,392
  6. Step 6: Final answer
    x = 46,482

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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.