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Finding the Fourth Proportional to 7,935.80, 11,931.15 and 7,421.90

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Solution

The fourth proportional to 7,935.80, 11,931.15 and 7,421.90 is: 11,158.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,935.80 : 11,931.15 = 7,421.90 : x
  2. Step 2: Convert to fraction form
    7,935.80/11,931.15 = 7,421.90/x
  3. Step 3: Cross multiply
    7,935.80x = 11,931.15 × 7,421.90
  4. Step 4: Simplify right side
    7,935.80x = 88,551,802.19
  5. Step 5: Solve for x
    x = 88,551,802.19/7,935.80
  6. Step 6: Final answer
    x = 11,158.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.