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Finding the Fourth Proportional to 7,778.70, 10,721.70 and 5,507.06

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Solution

The fourth proportional to 7,778.70, 10,721.70 and 5,507.06 is: 7,590.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,778.70 : 10,721.70 = 5,507.06 : x
  2. Step 2: Convert to fraction form
    7,778.70/10,721.70 = 5,507.06/x
  3. Step 3: Cross multiply
    7,778.70x = 10,721.70 × 5,507.06
  4. Step 4: Simplify right side
    7,778.70x = 59,044,991.59
  5. Step 5: Solve for x
    x = 59,044,991.59/7,778.70
  6. Step 6: Final answer
    x = 7,590.60

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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.