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Finding the Fourth Proportional to 1,428.84, 1,972.08 and 904.50

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Solution

The fourth proportional to 1,428.84, 1,972.08 and 904.50 is: 1,248.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.84 : 1,972.08 = 904.50 : x
  2. Step 2: Convert to fraction form
    1,428.84/1,972.08 = 904.50/x
  3. Step 3: Cross multiply
    1,428.84x = 1,972.08 × 904.50
  4. Step 4: Simplify right side
    1,428.84x = 1,783,746.36
  5. Step 5: Solve for x
    x = 1,783,746.36/1,428.84
  6. Step 6: Final answer
    x = 1,248.39

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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.