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Finding the Fourth Proportional to 78,381.90, 117,538.83 and 28,445.40

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Solution

The fourth proportional to 78,381.90, 117,538.83 and 28,445.40 is: 42,655.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,381.90 : 117,538.83 = 28,445.40 : x
  2. Step 2: Convert to fraction form
    78,381.90/117,538.83 = 28,445.40/x
  3. Step 3: Cross multiply
    78,381.90x = 117,538.83 × 28,445.40
  4. Step 4: Simplify right side
    78,381.90x = 3,343,439,034.88
  5. Step 5: Solve for x
    x = 3,343,439,034.88/78,381.90
  6. Step 6: Final answer
    x = 42,655.75

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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.