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Finding the Fourth Proportional to 4,890.40, 7,339.20 and 1,970.80

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Solution

The fourth proportional to 4,890.40, 7,339.20 and 1,970.80 is: 2,957.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,890.40 : 7,339.20 = 1,970.80 : x
  2. Step 2: Convert to fraction form
    4,890.40/7,339.20 = 1,970.80/x
  3. Step 3: Cross multiply
    4,890.40x = 7,339.20 × 1,970.80
  4. Step 4: Simplify right side
    4,890.40x = 14,464,095.36
  5. Step 5: Solve for x
    x = 14,464,095.36/4,890.40
  6. Step 6: Final answer
    x = 2,957.65

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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.