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Finding the Fourth Proportional to 63,128.40, 94,692.60 and 39,781.20

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Solution

The fourth proportional to 63,128.40, 94,692.60 and 39,781.20 is: 59,671.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    63,128.40 : 94,692.60 = 39,781.20 : x
  2. Step 2: Convert to fraction form
    63,128.40/94,692.60 = 39,781.20/x
  3. Step 3: Cross multiply
    63,128.40x = 94,692.60 × 39,781.20
  4. Step 4: Simplify right side
    63,128.40x = 3,766,985,259.12
  5. Step 5: Solve for x
    x = 3,766,985,259.12/63,128.40
  6. Step 6: Final answer
    x = 59,671.80

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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.