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Finding the Fourth Proportional to 1,019.61, 1,407.11 and 626.76

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Solution

The fourth proportional to 1,019.61, 1,407.11 and 626.76 is: 864.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.61 : 1,407.11 = 626.76 : x
  2. Step 2: Convert to fraction form
    1,019.61/1,407.11 = 626.76/x
  3. Step 3: Cross multiply
    1,019.61x = 1,407.11 × 626.76
  4. Step 4: Simplify right side
    1,019.61x = 881,917.13
  5. Step 5: Solve for x
    x = 881,917.13/1,019.61
  6. Step 6: Final answer
    x = 864.96

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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.