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Finding the Fourth Proportional to 85,978.13, 118,656.90 and 47,740.05

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Solution

The fourth proportional to 85,978.13, 118,656.90 and 47,740.05 is: 65,885.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,978.13 : 118,656.90 = 47,740.05 : x
  2. Step 2: Convert to fraction form
    85,978.13/118,656.90 = 47,740.05/x
  3. Step 3: Cross multiply
    85,978.13x = 118,656.90 × 47,740.05
  4. Step 4: Simplify right side
    85,978.13x = 5,664,686,338.85
  5. Step 5: Solve for x
    x = 5,664,686,338.85/85,978.13
  6. Step 6: Final answer
    x = 65,885.20

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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.