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Finding the Fourth Proportional to 930.47, 1,284.21 and 709.01

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Solution

The fourth proportional to 930.47, 1,284.21 and 709.01 is: 978.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.47 : 1,284.21 = 709.01 : x
  2. Step 2: Convert to fraction form
    930.47/1,284.21 = 709.01/x
  3. Step 3: Cross multiply
    930.47x = 1,284.21 × 709.01
  4. Step 4: Simplify right side
    930.47x = 910,507.77
  5. Step 5: Solve for x
    x = 910,507.77/930.47
  6. Step 6: Final answer
    x = 978.55

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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.