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Finding the Fourth Proportional to 1,478, 2,038.56 and 947.18

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Solution

The fourth proportional to 1,478, 2,038.56 and 947.18 is: 1,306.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478 : 2,038.56 = 947.18 : x
  2. Step 2: Convert to fraction form
    1,478/2,038.56 = 947.18/x
  3. Step 3: Cross multiply
    1,478x = 2,038.56 × 947.18
  4. Step 4: Simplify right side
    1,478x = 1,930,883.26
  5. Step 5: Solve for x
    x = 1,930,883.26/1,478
  6. Step 6: Final answer
    x = 1,306.42

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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.