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Finding the Fourth Proportional to 109,397.20, 163,980.60 and 42,811.60

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Solution

The fourth proportional to 109,397.20, 163,980.60 and 42,811.60 is: 64,172.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,397.20 : 163,980.60 = 42,811.60 : x
  2. Step 2: Convert to fraction form
    109,397.20/163,980.60 = 42,811.60/x
  3. Step 3: Cross multiply
    109,397.20x = 163,980.60 × 42,811.60
  4. Step 4: Simplify right side
    109,397.20x = 7,020,271,854.96
  5. Step 5: Solve for x
    x = 7,020,271,854.96/109,397.20
  6. Step 6: Final answer
    x = 64,172.32

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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.