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Finding the Fourth Proportional to 72,690.84, 109,015.20 and 28,307.70

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Solution

The fourth proportional to 72,690.84, 109,015.20 and 28,307.70 is: 42,453.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,690.84 : 109,015.20 = 28,307.70 : x
  2. Step 2: Convert to fraction form
    72,690.84/109,015.20 = 28,307.70/x
  3. Step 3: Cross multiply
    72,690.84x = 109,015.20 × 28,307.70
  4. Step 4: Simplify right side
    72,690.84x = 3,085,969,577.04
  5. Step 5: Solve for x
    x = 3,085,969,577.04/72,690.84
  6. Step 6: Final answer
    x = 42,453.35

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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.