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Finding the Fourth Proportional to 1,986.04, 2,978.92 and 525.16

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Solution

The fourth proportional to 1,986.04, 2,978.92 and 525.16 is: 787.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.04 : 2,978.92 = 525.16 : x
  2. Step 2: Convert to fraction form
    1,986.04/2,978.92 = 525.16/x
  3. Step 3: Cross multiply
    1,986.04x = 2,978.92 × 525.16
  4. Step 4: Simplify right side
    1,986.04x = 1,564,409.63
  5. Step 5: Solve for x
    x = 1,564,409.63/1,986.04
  6. Step 6: Final answer
    x = 787.70

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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.