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Finding the Fourth Proportional to 1,298.84, 1,948.54 and 477.12

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Solution

The fourth proportional to 1,298.84, 1,948.54 and 477.12 is: 715.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.84 : 1,948.54 = 477.12 : x
  2. Step 2: Convert to fraction form
    1,298.84/1,948.54 = 477.12/x
  3. Step 3: Cross multiply
    1,298.84x = 1,948.54 × 477.12
  4. Step 4: Simplify right side
    1,298.84x = 929,687.40
  5. Step 5: Solve for x
    x = 929,687.40/1,298.84
  6. Step 6: Final answer
    x = 715.78

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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.