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Finding the Fourth Proportional to 9,909.76, 13,658.88 and 7,913.92

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Solution

The fourth proportional to 9,909.76, 13,658.88 and 7,913.92 is: 10,907.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,909.76 : 13,658.88 = 7,913.92 : x
  2. Step 2: Convert to fraction form
    9,909.76/13,658.88 = 7,913.92/x
  3. Step 3: Cross multiply
    9,909.76x = 13,658.88 × 7,913.92
  4. Step 4: Simplify right side
    9,909.76x = 108,095,283.61
  5. Step 5: Solve for x
    x = 108,095,283.61/9,909.76
  6. Step 6: Final answer
    x = 10,907.96

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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.