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Finding the Fourth Proportional to 12,390.59, 17,075.40 and 12,162.86

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Solution

The fourth proportional to 12,390.59, 17,075.40 and 12,162.86 is: 16,761.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.59 : 17,075.40 = 12,162.86 : x
  2. Step 2: Convert to fraction form
    12,390.59/17,075.40 = 12,162.86/x
  3. Step 3: Cross multiply
    12,390.59x = 17,075.40 × 12,162.86
  4. Step 4: Simplify right side
    12,390.59x = 207,685,699.64
  5. Step 5: Solve for x
    x = 207,685,699.64/12,390.59
  6. Step 6: Final answer
    x = 16,761.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.