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Finding the Fourth Proportional to 85,692.60, 128,538.90 and 50,117.40

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Solution

The fourth proportional to 85,692.60, 128,538.90 and 50,117.40 is: 75,176.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,692.60 : 128,538.90 = 50,117.40 : x
  2. Step 2: Convert to fraction form
    85,692.60/128,538.90 = 50,117.40/x
  3. Step 3: Cross multiply
    85,692.60x = 128,538.90 × 50,117.40
  4. Step 4: Simplify right side
    85,692.60x = 6,442,035,466.86
  5. Step 5: Solve for x
    x = 6,442,035,466.86/85,692.60
  6. Step 6: Final answer
    x = 75,176.10

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1.5x scale

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.