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Finding the Fourth Proportional to 12,864.90, 19,282.95 and 7,320.90

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Solution

The fourth proportional to 12,864.90, 19,282.95 and 7,320.90 is: 10,973.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,864.90 : 19,282.95 = 7,320.90 : x
  2. Step 2: Convert to fraction form
    12,864.90/19,282.95 = 7,320.90/x
  3. Step 3: Cross multiply
    12,864.90x = 19,282.95 × 7,320.90
  4. Step 4: Simplify right side
    12,864.90x = 141,168,548.66
  5. Step 5: Solve for x
    x = 141,168,548.66/12,864.90
  6. Step 6: Final answer
    x = 10,973.16

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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.