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Finding the Fourth Proportional to 9,700.80, 13,390.47 and 5,721.63

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Solution

The fourth proportional to 9,700.80, 13,390.47 and 5,721.63 is: 7,897.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,700.80 : 13,390.47 = 5,721.63 : x
  2. Step 2: Convert to fraction form
    9,700.80/13,390.47 = 5,721.63/x
  3. Step 3: Cross multiply
    9,700.80x = 13,390.47 × 5,721.63
  4. Step 4: Simplify right side
    9,700.80x = 76,615,314.87
  5. Step 5: Solve for x
    x = 76,615,314.87/9,700.80
  6. Step 6: Final answer
    x = 7,897.83

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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.