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Finding the Fourth Proportional to 15,775.62, 21,770.16 and 8,605.51

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Solution

The fourth proportional to 15,775.62, 21,770.16 and 8,605.51 is: 11,875.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,775.62 : 21,770.16 = 8,605.51 : x
  2. Step 2: Convert to fraction form
    15,775.62/21,770.16 = 8,605.51/x
  3. Step 3: Cross multiply
    15,775.62x = 21,770.16 × 8,605.51
  4. Step 4: Simplify right side
    15,775.62x = 187,343,329.58
  5. Step 5: Solve for x
    x = 187,343,329.58/15,775.62
  6. Step 6: Final answer
    x = 11,875.50

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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.