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Finding the Fourth Proportional to 1,055.55, 1,457.16 and 787.04

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Solution

The fourth proportional to 1,055.55, 1,457.16 and 787.04 is: 1,086.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.55 : 1,457.16 = 787.04 : x
  2. Step 2: Convert to fraction form
    1,055.55/1,457.16 = 787.04/x
  3. Step 3: Cross multiply
    1,055.55x = 1,457.16 × 787.04
  4. Step 4: Simplify right side
    1,055.55x = 1,146,839.27
  5. Step 5: Solve for x
    x = 1,146,839.27/1,055.55
  6. Step 6: Final answer
    x = 1,086.49

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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.