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Finding the Fourth Proportional to 28,756.71, 39,681.45 and 21,207.15

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Solution

The fourth proportional to 28,756.71, 39,681.45 and 21,207.15 is: 29,263.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,756.71 : 39,681.45 = 21,207.15 : x
  2. Step 2: Convert to fraction form
    28,756.71/39,681.45 = 21,207.15/x
  3. Step 3: Cross multiply
    28,756.71x = 39,681.45 × 21,207.15
  4. Step 4: Simplify right side
    28,756.71x = 841,530,462.37
  5. Step 5: Solve for x
    x = 841,530,462.37/28,756.71
  6. Step 6: Final answer
    x = 29,263.79

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