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Finding the Fourth Proportional to 38,987.68, 58,476 and 12,692.80

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Solution

The fourth proportional to 38,987.68, 58,476 and 12,692.80 is: 19,037.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,987.68 : 58,476 = 12,692.80 : x
  2. Step 2: Convert to fraction form
    38,987.68/58,476 = 12,692.80/x
  3. Step 3: Cross multiply
    38,987.68x = 58,476 × 12,692.80
  4. Step 4: Simplify right side
    38,987.68x = 742,224,172.80
  5. Step 5: Solve for x
    x = 742,224,172.80/38,987.68
  6. Step 6: Final answer
    x = 19,037.40

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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.