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Finding the Fourth Proportional to 3,139.48, 4,709.66 and 948.38

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Solution

The fourth proportional to 3,139.48, 4,709.66 and 948.38 is: 1,422.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.48 : 4,709.66 = 948.38 : x
  2. Step 2: Convert to fraction form
    3,139.48/4,709.66 = 948.38/x
  3. Step 3: Cross multiply
    3,139.48x = 4,709.66 × 948.38
  4. Step 4: Simplify right side
    3,139.48x = 4,466,547.35
  5. Step 5: Solve for x
    x = 4,466,547.35/3,139.48
  6. Step 6: Final answer
    x = 1,422.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.