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Finding the Fourth Proportional to 28,528, 42,754.29 and 20,656.84

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Solution

The fourth proportional to 28,528, 42,754.29 and 20,656.84 is: 30,957.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,528 : 42,754.29 = 20,656.84 : x
  2. Step 2: Convert to fraction form
    28,528/42,754.29 = 20,656.84/x
  3. Step 3: Cross multiply
    28,528x = 42,754.29 × 20,656.84
  4. Step 4: Simplify right side
    28,528x = 883,168,527.84
  5. Step 5: Solve for x
    x = 883,168,527.84/28,528
  6. Step 6: Final answer
    x = 30,957.95

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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.