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Finding the Fourth Proportional to 8,959.17, 12,376.29 and 7,178.47

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Solution

The fourth proportional to 8,959.17, 12,376.29 and 7,178.47 is: 9,916.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,959.17 : 12,376.29 = 7,178.47 : x
  2. Step 2: Convert to fraction form
    8,959.17/12,376.29 = 7,178.47/x
  3. Step 3: Cross multiply
    8,959.17x = 12,376.29 × 7,178.47
  4. Step 4: Simplify right side
    8,959.17x = 88,842,826.48
  5. Step 5: Solve for x
    x = 88,842,826.48/8,959.17
  6. Step 6: Final answer
    x = 9,916.42

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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.