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Finding the Fourth Proportional to 4,781.79, 7,124.62 and 4,513.21

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Solution

The fourth proportional to 4,781.79, 7,124.62 and 4,513.21 is: 6,724.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,781.79 : 7,124.62 = 4,513.21 : x
  2. Step 2: Convert to fraction form
    4,781.79/7,124.62 = 4,513.21/x
  3. Step 3: Cross multiply
    4,781.79x = 7,124.62 × 4,513.21
  4. Step 4: Simplify right side
    4,781.79x = 32,154,859.32
  5. Step 5: Solve for x
    x = 32,154,859.32/4,781.79
  6. Step 6: Final answer
    x = 6,724.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.