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Finding the Fourth Proportional to 78,477.20, 117,729.90 and 28,627.23

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Solution

The fourth proportional to 78,477.20, 117,729.90 and 28,627.23 is: 42,945.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,477.20 : 117,729.90 = 28,627.23 : x
  2. Step 2: Convert to fraction form
    78,477.20/117,729.90 = 28,627.23/x
  3. Step 3: Cross multiply
    78,477.20x = 117,729.90 × 28,627.23
  4. Step 4: Simplify right side
    78,477.20x = 3,370,280,925.18
  5. Step 5: Solve for x
    x = 3,370,280,925.18/78,477.20
  6. Step 6: Final answer
    x = 42,945.99

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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.