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Finding the Fourth Proportional to 28,658.01, 42,931.10 and 18,767.31

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Solution

The fourth proportional to 28,658.01, 42,931.10 and 18,767.31 is: 28,114.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,658.01 : 42,931.10 = 18,767.31 : x
  2. Step 2: Convert to fraction form
    28,658.01/42,931.10 = 18,767.31/x
  3. Step 3: Cross multiply
    28,658.01x = 42,931.10 × 18,767.31
  4. Step 4: Simplify right side
    28,658.01x = 805,701,262.34
  5. Step 5: Solve for x
    x = 805,701,262.34/28,658.01
  6. Step 6: Final answer
    x = 28,114.35

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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.