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Finding the Fourth Proportional to 15,692.79, 21,660.12 and 9,720.93

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Solution

The fourth proportional to 15,692.79, 21,660.12 and 9,720.93 is: 13,417.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,692.79 : 21,660.12 = 9,720.93 : x
  2. Step 2: Convert to fraction form
    15,692.79/21,660.12 = 9,720.93/x
  3. Step 3: Cross multiply
    15,692.79x = 21,660.12 × 9,720.93
  4. Step 4: Simplify right side
    15,692.79x = 210,556,510.31
  5. Step 5: Solve for x
    x = 210,556,510.31/15,692.79
  6. Step 6: Final answer
    x = 13,417.40

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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.