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Finding the Fourth Proportional to 7,680.90, 11,513.10 and 4,386.90

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Solution

The fourth proportional to 7,680.90, 11,513.10 and 4,386.90 is: 6,575.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,680.90 : 11,513.10 = 4,386.90 : x
  2. Step 2: Convert to fraction form
    7,680.90/11,513.10 = 4,386.90/x
  3. Step 3: Cross multiply
    7,680.90x = 11,513.10 × 4,386.90
  4. Step 4: Simplify right side
    7,680.90x = 50,506,818.39
  5. Step 5: Solve for x
    x = 50,506,818.39/7,680.90
  6. Step 6: Final answer
    x = 6,575.64

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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.