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Finding the Fourth Proportional to 9,139.74, 12,612.88 and 4,947.98

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Solution

The fourth proportional to 9,139.74, 12,612.88 and 4,947.98 is: 6,828.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,139.74 : 12,612.88 = 4,947.98 : x
  2. Step 2: Convert to fraction form
    9,139.74/12,612.88 = 4,947.98/x
  3. Step 3: Cross multiply
    9,139.74x = 12,612.88 × 4,947.98
  4. Step 4: Simplify right side
    9,139.74x = 62,408,277.98
  5. Step 5: Solve for x
    x = 62,408,277.98/9,139.74
  6. Step 6: Final answer
    x = 6,828.23

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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.