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Finding the Fourth Proportional to 1,127.10, 1,555.57 and 655.21

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Solution

The fourth proportional to 1,127.10, 1,555.57 and 655.21 is: 904.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.10 : 1,555.57 = 655.21 : x
  2. Step 2: Convert to fraction form
    1,127.10/1,555.57 = 655.21/x
  3. Step 3: Cross multiply
    1,127.10x = 1,555.57 × 655.21
  4. Step 4: Simplify right side
    1,127.10x = 1,019,225.02
  5. Step 5: Solve for x
    x = 1,019,225.02/1,127.10
  6. Step 6: Final answer
    x = 904.29

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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.