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Finding the Fourth Proportional to 972.21, 1,458.32 and 355.93

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Solution

The fourth proportional to 972.21, 1,458.32 and 355.93 is: 533.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.21 : 1,458.32 = 355.93 : x
  2. Step 2: Convert to fraction form
    972.21/1,458.32 = 355.93/x
  3. Step 3: Cross multiply
    972.21x = 1,458.32 × 355.93
  4. Step 4: Simplify right side
    972.21x = 519,059.84
  5. Step 5: Solve for x
    x = 519,059.84/972.21
  6. Step 6: Final answer
    x = 533.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.