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Finding the Fourth Proportional to 972.35, 1,457.21 and 355.47

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Solution

The fourth proportional to 972.35, 1,457.21 and 355.47 is: 532.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.35 : 1,457.21 = 355.47 : x
  2. Step 2: Convert to fraction form
    972.35/1,457.21 = 355.47/x
  3. Step 3: Cross multiply
    972.35x = 1,457.21 × 355.47
  4. Step 4: Simplify right side
    972.35x = 517,994.44
  5. Step 5: Solve for x
    x = 517,994.44/972.35
  6. Step 6: Final answer
    x = 532.72

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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.