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Finding the Fourth Proportional to 1,041.76, 1,438.20 and 710.68

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Solution

The fourth proportional to 1,041.76, 1,438.20 and 710.68 is: 981.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,041.76 : 1,438.20 = 710.68 : x
  2. Step 2: Convert to fraction form
    1,041.76/1,438.20 = 710.68/x
  3. Step 3: Cross multiply
    1,041.76x = 1,438.20 × 710.68
  4. Step 4: Simplify right side
    1,041.76x = 1,022,099.98
  5. Step 5: Solve for x
    x = 1,022,099.98/1,041.76
  6. Step 6: Final answer
    x = 981.13

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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.