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Finding the Fourth Proportional to 28,159.58, 42,239.40 and 12,360.98

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Solution

The fourth proportional to 28,159.58, 42,239.40 and 12,360.98 is: 18,541.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,159.58 : 42,239.40 = 12,360.98 : x
  2. Step 2: Convert to fraction form
    28,159.58/42,239.40 = 12,360.98/x
  3. Step 3: Cross multiply
    28,159.58x = 42,239.40 × 12,360.98
  4. Step 4: Simplify right side
    28,159.58x = 522,120,378.61
  5. Step 5: Solve for x
    x = 522,120,378.61/28,159.58
  6. Step 6: Final answer
    x = 18,541.48

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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.