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Finding the Fourth Proportional to 705.28, 973.24 and 390.53

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Solution

The fourth proportional to 705.28, 973.24 and 390.53 is: 538.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.28 : 973.24 = 390.53 : x
  2. Step 2: Convert to fraction form
    705.28/973.24 = 390.53/x
  3. Step 3: Cross multiply
    705.28x = 973.24 × 390.53
  4. Step 4: Simplify right side
    705.28x = 380,079.42
  5. Step 5: Solve for x
    x = 380,079.42/705.28
  6. Step 6: Final answer
    x = 538.91

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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.