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Finding the Fourth Proportional to 86,428.99, 129,642.84 and 39,018.46

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Solution

The fourth proportional to 86,428.99, 129,642.84 and 39,018.46 is: 58,527.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,428.99 : 129,642.84 = 39,018.46 : x
  2. Step 2: Convert to fraction form
    86,428.99/129,642.84 = 39,018.46/x
  3. Step 3: Cross multiply
    86,428.99x = 129,642.84 × 39,018.46
  4. Step 4: Simplify right side
    86,428.99x = 5,058,463,966.83
  5. Step 5: Solve for x
    x = 5,058,463,966.83/86,428.99
  6. Step 6: Final answer
    x = 58,527.40

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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.