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Finding the Fourth Proportional to 139,780.80, 209,671.20 and 46,274.40

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Solution

The fourth proportional to 139,780.80, 209,671.20 and 46,274.40 is: 69,411.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,780.80 : 209,671.20 = 46,274.40 : x
  2. Step 2: Convert to fraction form
    139,780.80/209,671.20 = 46,274.40/x
  3. Step 3: Cross multiply
    139,780.80x = 209,671.20 × 46,274.40
  4. Step 4: Simplify right side
    139,780.80x = 9,702,408,977.28
  5. Step 5: Solve for x
    x = 9,702,408,977.28/139,780.80
  6. Step 6: Final answer
    x = 69,411.60

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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.