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Finding the Fourth Proportional to 87,095, 130,643.14 and 21,431

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Solution

The fourth proportional to 87,095, 130,643.14 and 21,431 is: 32,146.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,095 : 130,643.14 = 21,431 : x
  2. Step 2: Convert to fraction form
    87,095/130,643.14 = 21,431/x
  3. Step 3: Cross multiply
    87,095x = 130,643.14 × 21,431
  4. Step 4: Simplify right side
    87,095x = 2,799,813,133.34
  5. Step 5: Solve for x
    x = 2,799,813,133.34/87,095
  6. Step 6: Final answer
    x = 32,146.66

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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.