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Finding the Fourth Proportional to 39,420, 59,130 and 11,718

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Solution

The fourth proportional to 39,420, 59,130 and 11,718 is: 17,577

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,420 : 59,130 = 11,718 : x
  2. Step 2: Convert to fraction form
    39,420/59,130 = 11,718/x
  3. Step 3: Cross multiply
    39,420x = 59,130 × 11,718
  4. Step 4: Simplify right side
    39,420x = 692,885,340
  5. Step 5: Solve for x
    x = 692,885,340/39,420
  6. Step 6: Final answer
    x = 17,577

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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.