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Finding the Fourth Proportional to 7,920.95, 10,931.21 and 4,384.08

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Solution

The fourth proportional to 7,920.95, 10,931.21 and 4,384.08 is: 6,050.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.95 : 10,931.21 = 4,384.08 : x
  2. Step 2: Convert to fraction form
    7,920.95/10,931.21 = 4,384.08/x
  3. Step 3: Cross multiply
    7,920.95x = 10,931.21 × 4,384.08
  4. Step 4: Simplify right side
    7,920.95x = 47,923,277.22
  5. Step 5: Solve for x
    x = 47,923,277.22/7,920.95
  6. Step 6: Final answer
    x = 6,050.20

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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.