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Finding the Fourth Proportional to 28,710.71, 39,620.90 and 15,965.06

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Solution

The fourth proportional to 28,710.71, 39,620.90 and 15,965.06 is: 22,031.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,710.71 : 39,620.90 = 15,965.06 : x
  2. Step 2: Convert to fraction form
    28,710.71/39,620.90 = 15,965.06/x
  3. Step 3: Cross multiply
    28,710.71x = 39,620.90 × 15,965.06
  4. Step 4: Simplify right side
    28,710.71x = 632,549,887.56
  5. Step 5: Solve for x
    x = 632,549,887.56/28,710.71
  6. Step 6: Final answer
    x = 22,031.85

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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.