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Finding the Fourth Proportional to 1,323.84, 1,985.28 and 553.92

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Solution

The fourth proportional to 1,323.84, 1,985.28 and 553.92 is: 830.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.84 : 1,985.28 = 553.92 : x
  2. Step 2: Convert to fraction form
    1,323.84/1,985.28 = 553.92/x
  3. Step 3: Cross multiply
    1,323.84x = 1,985.28 × 553.92
  4. Step 4: Simplify right side
    1,323.84x = 1,099,686.30
  5. Step 5: Solve for x
    x = 1,099,686.30/1,323.84
  6. Step 6: Final answer
    x = 830.68

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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.