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Finding the Fourth Proportional to 7,809.22, 10,780.25 and 4,980.40

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Solution

The fourth proportional to 7,809.22, 10,780.25 and 4,980.40 is: 6,875.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,809.22 : 10,780.25 = 4,980.40 : x
  2. Step 2: Convert to fraction form
    7,809.22/10,780.25 = 4,980.40/x
  3. Step 3: Cross multiply
    7,809.22x = 10,780.25 × 4,980.40
  4. Step 4: Simplify right side
    7,809.22x = 53,689,957.10
  5. Step 5: Solve for x
    x = 53,689,957.10/7,809.22
  6. Step 6: Final answer
    x = 6,875.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.