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Finding the Fourth Proportional to 1,283.80, 1,925.80 and 553.40

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Solution

The fourth proportional to 1,283.80, 1,925.80 and 553.40 is: 830.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.80 : 1,925.80 = 553.40 : x
  2. Step 2: Convert to fraction form
    1,283.80/1,925.80 = 553.40/x
  3. Step 3: Cross multiply
    1,283.80x = 1,925.80 × 553.40
  4. Step 4: Simplify right side
    1,283.80x = 1,065,737.72
  5. Step 5: Solve for x
    x = 1,065,737.72/1,283.80
  6. Step 6: Final answer
    x = 830.14

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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.