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Finding the Fourth Proportional to 12,891.88, 19,332.12 and 6,655.40

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Solution

The fourth proportional to 12,891.88, 19,332.12 and 6,655.40 is: 9,980.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.88 : 19,332.12 = 6,655.40 : x
  2. Step 2: Convert to fraction form
    12,891.88/19,332.12 = 6,655.40/x
  3. Step 3: Cross multiply
    12,891.88x = 19,332.12 × 6,655.40
  4. Step 4: Simplify right side
    12,891.88x = 128,662,991.45
  5. Step 5: Solve for x
    x = 128,662,991.45/12,891.88
  6. Step 6: Final answer
    x = 9,980.16

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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.