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Finding the Fourth Proportional to 1,127.26, 1,555.70 and 630

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Solution

The fourth proportional to 1,127.26, 1,555.70 and 630 is: 869.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.26 : 1,555.70 = 630 : x
  2. Step 2: Convert to fraction form
    1,127.26/1,555.70 = 630/x
  3. Step 3: Cross multiply
    1,127.26x = 1,555.70 × 630
  4. Step 4: Simplify right side
    1,127.26x = 980,091
  5. Step 5: Solve for x
    x = 980,091/1,127.26
  6. Step 6: Final answer
    x = 869.45

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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.