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Finding the Fourth Proportional to 28,574, 39,449.40 and 18,655.28

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Solution

The fourth proportional to 28,574, 39,449.40 and 18,655.28 is: 25,755.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,574 : 39,449.40 = 18,655.28 : x
  2. Step 2: Convert to fraction form
    28,574/39,449.40 = 18,655.28/x
  3. Step 3: Cross multiply
    28,574x = 39,449.40 × 18,655.28
  4. Step 4: Simplify right side
    28,574x = 735,939,602.83
  5. Step 5: Solve for x
    x = 735,939,602.83/28,574
  6. Step 6: Final answer
    x = 25,755.57

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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.