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Finding the Fourth Proportional to 19,218.90, 28,776.24 and 9,965.46

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Solution

The fourth proportional to 19,218.90, 28,776.24 and 9,965.46 is: 14,921.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,218.90 : 28,776.24 = 9,965.46 : x
  2. Step 2: Convert to fraction form
    19,218.90/28,776.24 = 9,965.46/x
  3. Step 3: Cross multiply
    19,218.90x = 28,776.24 × 9,965.46
  4. Step 4: Simplify right side
    19,218.90x = 286,768,468.67
  5. Step 5: Solve for x
    x = 286,768,468.67/19,218.90
  6. Step 6: Final answer
    x = 14,921.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.