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Finding the Fourth Proportional to 21,605.40, 29,818.80 and 12,652.20

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Solution

The fourth proportional to 21,605.40, 29,818.80 and 12,652.20 is: 17,462.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,605.40 : 29,818.80 = 12,652.20 : x
  2. Step 2: Convert to fraction form
    21,605.40/29,818.80 = 12,652.20/x
  3. Step 3: Cross multiply
    21,605.40x = 29,818.80 × 12,652.20
  4. Step 4: Simplify right side
    21,605.40x = 377,273,421.36
  5. Step 5: Solve for x
    x = 377,273,421.36/21,605.40
  6. Step 6: Final answer
    x = 17,462.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.