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Finding the Fourth Proportional to 8,955.54, 12,357.69 and 5,178.11

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Solution

The fourth proportional to 8,955.54, 12,357.69 and 5,178.11 is: 7,145.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,955.54 : 12,357.69 = 5,178.11 : x
  2. Step 2: Convert to fraction form
    8,955.54/12,357.69 = 5,178.11/x
  3. Step 3: Cross multiply
    8,955.54x = 12,357.69 × 5,178.11
  4. Step 4: Simplify right side
    8,955.54x = 63,989,478.17
  5. Step 5: Solve for x
    x = 63,989,478.17/8,955.54
  6. Step 6: Final answer
    x = 7,145.24

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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.