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Finding the Fourth Proportional to 38,398.90, 52,988.78 and 21,405

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Solution

The fourth proportional to 38,398.90, 52,988.78 and 21,405 is: 29,537.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,398.90 : 52,988.78 = 21,405 : x
  2. Step 2: Convert to fraction form
    38,398.90/52,988.78 = 21,405/x
  3. Step 3: Cross multiply
    38,398.90x = 52,988.78 × 21,405
  4. Step 4: Simplify right side
    38,398.90x = 1,134,224,835.90
  5. Step 5: Solve for x
    x = 1,134,224,835.90/38,398.90
  6. Step 6: Final answer
    x = 29,537.95

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1.5x scale

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.