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Finding the Fourth Proportional to 5,613.20, 7,870 and 5,613.20

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Solution

The fourth proportional to 5,613.20, 7,870 and 5,613.20 is: 7,870

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,613.20 : 7,870 = 5,613.20 : x
  2. Step 2: Convert to fraction form
    5,613.20/7,870 = 5,613.20/x
  3. Step 3: Cross multiply
    5,613.20x = 7,870 × 5,613.20
  4. Step 4: Simplify right side
    5,613.20x = 44,175,884
  5. Step 5: Solve for x
    x = 44,175,884/5,613.20
  6. Step 6: Final answer
    x = 7,870

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.