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Finding the Fourth Proportional to 7,955.59, 10,978.77 and 4,811.17

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Solution

The fourth proportional to 7,955.59, 10,978.77 and 4,811.17 is: 6,639.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,955.59 : 10,978.77 = 4,811.17 : x
  2. Step 2: Convert to fraction form
    7,955.59/10,978.77 = 4,811.17/x
  3. Step 3: Cross multiply
    7,955.59x = 10,978.77 × 4,811.17
  4. Step 4: Simplify right side
    7,955.59x = 52,820,728.86
  5. Step 5: Solve for x
    x = 52,820,728.86/7,955.59
  6. Step 6: Final answer
    x = 6,639.45

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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.