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Finding the Fourth Proportional to 787.02, 1,086.15 and 455.55

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Solution

The fourth proportional to 787.02, 1,086.15 and 455.55 is: 628.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.02 : 1,086.15 = 455.55 : x
  2. Step 2: Convert to fraction form
    787.02/1,086.15 = 455.55/x
  3. Step 3: Cross multiply
    787.02x = 1,086.15 × 455.55
  4. Step 4: Simplify right side
    787.02x = 494,795.63
  5. Step 5: Solve for x
    x = 494,795.63/787.02
  6. Step 6: Final answer
    x = 628.70

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1.5x scale

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.