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Finding the Fourth Proportional to 15,615.61, 21,549.71 and 8,541.88

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Solution

The fourth proportional to 15,615.61, 21,549.71 and 8,541.88 is: 11,787.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,615.61 : 21,549.71 = 8,541.88 : x
  2. Step 2: Convert to fraction form
    15,615.61/21,549.71 = 8,541.88/x
  3. Step 3: Cross multiply
    15,615.61x = 21,549.71 × 8,541.88
  4. Step 4: Simplify right side
    15,615.61x = 184,075,036.85
  5. Step 5: Solve for x
    x = 184,075,036.85/15,615.61
  6. Step 6: Final answer
    x = 11,787.89

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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.