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Finding the Fourth Proportional to 700.50, 1,051.20 and 315.75

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Solution

The fourth proportional to 700.50, 1,051.20 and 315.75 is: 473.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.50 : 1,051.20 = 315.75 : x
  2. Step 2: Convert to fraction form
    700.50/1,051.20 = 315.75/x
  3. Step 3: Cross multiply
    700.50x = 1,051.20 × 315.75
  4. Step 4: Simplify right side
    700.50x = 331,916.40
  5. Step 5: Solve for x
    x = 331,916.40/700.50
  6. Step 6: Final answer
    x = 473.83

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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.