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Finding the Fourth Proportional to 12,655.40, 18,978.42 and 7,392.20

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Solution

The fourth proportional to 12,655.40, 18,978.42 and 7,392.20 is: 11,085.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,655.40 : 18,978.42 = 7,392.20 : x
  2. Step 2: Convert to fraction form
    12,655.40/18,978.42 = 7,392.20/x
  3. Step 3: Cross multiply
    12,655.40x = 18,978.42 × 7,392.20
  4. Step 4: Simplify right side
    12,655.40x = 140,292,276.32
  5. Step 5: Solve for x
    x = 140,292,276.32/12,655.40
  6. Step 6: Final answer
    x = 11,085.57

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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.