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Finding the Fourth Proportional to 28,437.79, 42,569.19 and 18,555.79

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Solution

The fourth proportional to 28,437.79, 42,569.19 and 18,555.79 is: 27,776.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,437.79 : 42,569.19 = 18,555.79 : x
  2. Step 2: Convert to fraction form
    28,437.79/42,569.19 = 18,555.79/x
  3. Step 3: Cross multiply
    28,437.79x = 42,569.19 × 18,555.79
  4. Step 4: Simplify right side
    28,437.79x = 789,904,950.11
  5. Step 5: Solve for x
    x = 789,904,950.11/28,437.79
  6. Step 6: Final answer
    x = 27,776.59

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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.