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Finding the Fourth Proportional to 1,041.66, 1,436.40 and 709.83

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Solution

The fourth proportional to 1,041.66, 1,436.40 and 709.83 is: 978.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,041.66 : 1,436.40 = 709.83 : x
  2. Step 2: Convert to fraction form
    1,041.66/1,436.40 = 709.83/x
  3. Step 3: Cross multiply
    1,041.66x = 1,436.40 × 709.83
  4. Step 4: Simplify right side
    1,041.66x = 1,019,599.81
  5. Step 5: Solve for x
    x = 1,019,599.81/1,041.66
  6. Step 6: Final answer
    x = 978.82

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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.