Home / 28,530.63-39,369.22-15,781.78

Finding the Fourth Proportional to 28,530.63, 39,369.22 and 15,781.78

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Solution

The fourth proportional to 28,530.63, 39,369.22 and 15,781.78 is: 21,777.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,530.63 : 39,369.22 = 15,781.78 : x
  2. Step 2: Convert to fraction form
    28,530.63/39,369.22 = 15,781.78/x
  3. Step 3: Cross multiply
    28,530.63x = 39,369.22 × 15,781.78
  4. Step 4: Simplify right side
    28,530.63x = 621,316,368.81
  5. Step 5: Solve for x
    x = 621,316,368.81/28,530.63
  6. Step 6: Final answer
    x = 21,777.17

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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.