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Finding the Fourth Proportional to 777.19, 1,071.12 and 630.18

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Solution

The fourth proportional to 777.19, 1,071.12 and 630.18 is: 868.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.19 : 1,071.12 = 630.18 : x
  2. Step 2: Convert to fraction form
    777.19/1,071.12 = 630.18/x
  3. Step 3: Cross multiply
    777.19x = 1,071.12 × 630.18
  4. Step 4: Simplify right side
    777.19x = 674,998.40
  5. Step 5: Solve for x
    x = 674,998.40/777.19
  6. Step 6: Final answer
    x = 868.51

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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.