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Finding the Fourth Proportional to 15,688.80, 21,658.80 and 9,717.60

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Solution

The fourth proportional to 15,688.80, 21,658.80 and 9,717.60 is: 13,415.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,688.80 : 21,658.80 = 9,717.60 : x
  2. Step 2: Convert to fraction form
    15,688.80/21,658.80 = 9,717.60/x
  3. Step 3: Cross multiply
    15,688.80x = 21,658.80 × 9,717.60
  4. Step 4: Simplify right side
    15,688.80x = 210,471,554.88
  5. Step 5: Solve for x
    x = 210,471,554.88/15,688.80
  6. Step 6: Final answer
    x = 13,415.40

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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.